Tech & Rec Slang....

[Andreas Triantopoulos]

50/50 Nitrox50. 50% O2, 50% N2. Commonly used as a travel mix.
80/20 Nitrox80. 80% O2, 20% N2. See stroke mix.




A AAS Alternate Air Source, such as a pony bottle. See discussion of ponies and Spare Air in rec.scuba FAQ.
ab(s) (1) Abalone(s), a California shell fish pursued by divers and sea otters. The sea otters are better at it.
abs (2) What studly macho divers think they have but don't.
ab irons Tool used to get abalone off rock.
ABLJ Adjustable Buoyacy Life Jacket, horse-collar style, forerunner of the BC. (British)
AGA A popular full face mask, the AGA Divator MKII. Pictures. In New York pronounced "auger" (with a strong "AW" sound in the beginning).
AGA and com gear An AGA equipped with a microphone and speakers to allow a diver to communicate by voice, typically through a wire to a surface support team.
AGE Arterial Gas Embolism, bubble causing obstruction to a blood vessel
AI Assistant Instructor
air hog Diver who sucks tank dry in record time. (Or in less time than it takes their buddy.)
aluminum 80 Most common tank in industry. Nominal capacity 80 cu. ft.
alpha flag International maritime signal flag, meaning "Diver down, keep clear!". Compare with the U.S. dive flag


AOW Advanced Open Water (PADI qualification)
artificial spit Small bottles of liquid purchased at exorbitant prices by divers who do not know better to keep their masks defogged. Made by having divemaster candidates fill small bottles with REAL spit.
artifact An item removed from a wreck. See souvenir.
ASD Atrial Septal Defect, 'Hole in Heart'
ATA Absolute pressure. Includes the atmospheres of pressure you rack up under the water and the atmosphere of pressure at the sea level ATM machine.
AV Artificial Ventilation. EAR. (British)




B back roll Leave a boat by sitting on its rail and then rolling backwards into the water.
backscatter What you get in your picture after bozo the CN kicks the bottom.
bail-out bottle (1) A small bottle filled with your favorite beverage to hold you until your friends come to bail you out of the Cozumel jail.
bail-out bottle (2) SD
bail-out bottle (3) Extra cylinder of gas carried by a surface supplied diver or a rebreather diver to enable them to reach safety in the event of an interruption of their primary supply. For saturation divers, this would typically be to reach a habitat.
barotrauma Damage caused by water or air pressure.
BC Buoyancy Compensator.
Braille dive Viz so bad you have to just feel your way around.
BCD Buoyancy Control Device.
beaver On old wetsuit jackets it hung down in the back. You pulled it through your legs, and velcroed it to the front of the jacket. Also called a beaver tail.
Historical note: Some 'real men' claim to have been able to fasten this without obtaining a high pitched voice. This is probably apocryphal.
bend-O-matic Dive computer
bent (1) Suffering from DCS.
bent (2) Suffering from too much tequila.
blowing off Omitting something, typically omitting required decompression.
blue water Un-green water. Typically found somewhere you are not. Like Cozumel.
bolt snap Brass or stainless steel fitting with a gate activated by your thumb.
bondage wings (1) Impressive looking back mounted BC by OMS. Features dozens of little rubber straps to confine the bladder when not inflated. Implicated in a number of tech diving tragedies.
bondage wing (2) A diving S&M toy
Bottle Cylinder.
bottom dump Valve on the bottom of a BC which allows you to empty air while in a head-down mode.
bottom mix (1) Mix breathed at the bottom, especially when other gas mixes are used for travel and/or deco. Bottom mix should have ppO2 less than 1.4. END is typically chosen to be 99 fsw or 132 fsw.
bottom mix (2) What is found in the bottom of used margarita glasses.
bounce
or bounce dive To dive and surface at intervals repeatedly. A dive where you turn around to ascend immediately after reaching the bottom.
BSAC British Sub Aqua Club.
BT Bottom Time - definition is agency dependant.
buddy (1) For the benefit of officious Divemasters - your nominal partner when you practice the "Same Day, Same Ocean" diving principle
buddy (2) The person who always sees more interesting things on a dive than you do; knows the scientific names of all of those furry little green things that live under rock ledges; reveals to the rest of the passengers that your diving techniques are all wrong; and leaves you to wash out their gear at the end of the day.
buddy (3) A person you're happy to go for a drink with.
bug Lobster. Also crawfish in Louisiana
bug bag Lobster Bag. Generally of mesh and/or canvas. To carry all the lobsters that you catch, or the artifacts you recover.
bug hunting Hunting for bugs.
butt-mounting Dangling the battery pack of a cannister light underneath your doubles, rather than on the right hip. Considered the height of strokery by Hogarthians.
BWRAF PADI training acronym: "Begin With Review And Friend". Alt: "Bad Women Really Are Fun"; "Big White Rabbits Are Furry"; "Boogie With the Rich And Famous"; "Bruce Willis Ruins All Films".




C canister light A light where the battery is strapped to your belt and the light is held in your hand.
CAPS Cave mapping software and electronic survey equipment
cattle boat We've all been there, done that. There are no cows on a cattleboat, at least not the four legged kind.
CESA Controlled Emergency Swimming Ascent
C-card Certification card
chamber (1) Hyperbaric chamber, for diagnosis and treatment of DCS
chamber (2) The room that contains the pot.
chamber ride (1) To be compressed in a chamber.
chamber ride (2) What you do on your last day at the hotel in Cozumel. See chamber (2).
charlie foxtrot Euphemism for clusterfuck, derived from initials.
check-out What you do on your last day at the hotel in Cozumel.
chokes Form of DCS in which you are unable to breathe effectively. Generally fatal unless treated quickly with on-site O2 and prompt recompression.
chumming Feeding the fishes. Performed voluntarily by fishermen in order to attract large fishes. Performed by divers involuntarily.
clear (1) equalize ears
clear (2) free of nitrogen - clear to fly
clusterfuck Complete pandemonium, often the result of strokery. Diving on the wrong day with the wrong equipment and the wrong attitude. American. See incident pit.
CM Cutis marmorata.
CMAS Conféderation Mondiale des Activitiés Subaquatiques, or in English the World Underwater Federation. International federation of scuba organisations. in the United States only the YMCA and the United Stateds Underwater Federation are members.
CN Clueless Newbie.
CNS O2 toxicity Also known as the Paul Bert Effect, tox, or oxtox.
computer Dive computer. I can't think of any time anyone thought we were talking about something with a keyboard.
CPR Cardio-Pulmonary Rescusitation
cricket A lobster below the legal size.
cu. ft. Cubic feet. 1 cubic foot = 28.31685 liters.
cylinder Tank




D DAN Divers Alert Network. When you have a big problem, call (919) 684-8111. Web site: http://www.diversalertnetwork.org.
DCI Decompression Illness, including DCS and AGE
DCS Decompression Sickness, the 'bends'
DDRC Diving Diseases Research Centre, in Plymouth, England. The leading hyperbaric treatment and research centre in Britain.
dead reckoning (1) Navigating without using external referents, using compass, initial known position, and estimates of speed, current, wind, etc.
dead reckoning (2) The navigation method preferred by divers who never learned to use a compass. So called because they are frequently found dead.
deco mix (1) Gas mixture used for decompression, such as 80/20 or 100% O2.
deco mix (2) alt: 1 part Bacardis, 1 part Jack Daniel's, 2 parts lemonade.
deep air Like deep throat, only different.
deep air diving alt: See muff diving
de-fizzing off-gassing. See Wrolf's Bubble Theory
alt: taking away feeshes fizzies
deserved hit DCS occuring after violating table or computer limits.
Doing It Right DIR
DIA Doom Induced Nausea. Feeling in the pit of your stomach when you are about to do a dive which is completely out of your comfort zone or experience. A George-ism.
DIN valves (1) Superior alternative to a yoke fitting for first stage. Screws in rather than clamps on, and O-ring is "captured" inside valve, reducing chance of O-ring failure.
DIN valves (2) The noise made when insufficient care is taken loading tanks into a vehicle, and the valves are banging together.
DIR Term invented by George Irvine III to describe the practices that he and others derived from Hogarthian principles. See Hogarthian Diving Style
dive Does anyone think this involves a springboard?
dive babe Woman who is a real diver - opposite of a chick
dive chick Female diver who puts on make-up; brushes hair; has her boyfriend assemble her kit; and then has him carry it to the water before doing her dive.
dive dry Diving in a dry suit.
dive flag Red flag with white diagonal stripe from top of staff to bottom of fly: . Means the same as the international alpha flag, but is almost unknown outside the U.S. and cultural vassals. Within or near U.S. waters, the best policy is to fly both. Outside, fly the alpha flag. DM Dive Master
double-disking Using 2 burst disks on the valve of your tank to decrease the chance of losing all your air.
double steel 104's Pair of steel cylinders, nominal capacity 104 cu. ft, connected together with bands and a manifold.
DPV Diver Propulsion Vehicle. Scooter.
drift deco hanging from a lift bag or DSMB during your deco (usually for high currents)
D rings D-shaped rings. Attach to BC webbing with weight retainers.
DSMB Delayed Surface Marker Buoy, SMB which is inflated at end of dive. (British)
DUI Diving Unlimited International. Manufacturer best known for their dry suits DV Demand Valve, usually the second stage. (British)




E EAD Equivalent Air Depth The depth at which air would cause as much decompression obligation as a nitrox with a given fO2 at a given depth. EAD = (Depth+33') fN2/0.79 - 33' = (Depth+33') (1-fO2)/0.79 - 33'

All depths in fsw .
EAN, EANx Enriched Air Nitrox
EAR Expired Air Rescusitation (preferred term now is AV in Britain)
EAV Expired Air Ventilation (British)
END Equivalent Narcotic Depth. The depth at which air would cause as much narcosis as a given mix and depth. END is typically chosen to be 99 fsw or 132 fsw for a bottom mix. Assuming that O2 and N2 are equally narcotic in practice; ignoring the narcotic potential of He (which is small, or perhaps non existent); and with depths in fsw:
END = ((1-fHe) (Depth / 33 +1)-1) * 33 = (Depth+33') (1-fHe) - 33'
Many texts have not been updated to reflect the finding that O2 and N2 are approximately equally narcotic, and instead attribute all narcosis to ppN2. This changes the formula to:
END = (( fN2/.791 ) (depth / 33 +1)-1) * 33 Obsolete
To make things worse, O2 & N2 are probably not equipotent for narcosis at all concentrations. It seems that at certain ratios, the O2 component is more narcotic than N2; and in other ratios, the N2 is more potent. See Narcosis on Wrolf's Wreck for further details.
But assuming O2 & N2 are equipotent for narcosis is the best current practice.
EX-buddy person who - after you have put up with all of their foibles - gets to the bar and insists that it's your shout!




F FAQ Collection of Frequently Asked Questions (and answers). See the rec.scuba FAQ.
fart bag Drysuit.
feed the fish vomit
FFA Feet First Ascent. Learning technique used by new drysuit divers.
FFM Full Face Mask
FFW Feet of Fresh Water
fin ladder A pole with pegs attached to either side to facilitate climbing out of the water with your fins on.
flounder gig A speargun spear with a SS cable attached to a T. This is used for flounder collecting.
fHe. Fraction of helium (He) in a mix. In air, fHe = 0, unless you are near certain natural gas wells, a birthday party, or tech divers.
fN2. Fraction of nitrogent (N2) in a mix. In air, fN2 = 0.791 = 79.1%. Actually this is a lie, counting the approximately 1% of other gasses in air (noble gasses etc.) as though they are nitrogen, but it is close enough.
fO2. Fraction of O2 in a mix. In air, fO2 = 0.209 = 20.9%.
free diver Breath hold diver. Good guys, see Freediver brings gas
foul the hook To tie the wreckhook upside down to facilitate leaving the wreck. Usually done by the last person up.
FSW Feet of Salt Water




G gaiters Rig designed to reduce the amount of air the lower legs of a drysuit. See FFA.
gerry line Granny line.
get wet What all divers want to do - go diving.
golden triangle Area between the chin and the nipples where it is easiest to access equipment such as knives and regulators.
Goodman handle A U-shaped attachment to the light head of a canister light for attaching the light head to your hand.
GPS Global Positioning System
granny line Line which goes from the stern platform or hangbar to the anchor line.




H h valve tank valve with two outlets.
halocline Boundary between layers of water of different salinities. Looks like a barrier of mist.
hang To perform a decompression stop.
hang bar Bar slung underneath boat for convenience during decompression stops
hang line Horizontal line rigged for convenience during decompression stops
hang tank Extra tank, ideally of deco mix, staged at deco stop.
Hawaiian sling A long spear with an elastic loop at one end and 3-pointed gig on the other. You catch the loop in your thumb and pull the spear back. When you let go, the spear shoots forward, hopefully into a fish.
heliox Breathing mix of helium and oxygen.
hit Incident of DCS.
Hogarthian principles Principles behind Hogarthian system, named for William Hogarth Main. Originated for cave diving but now adopted more widely. See Hogarthian Diving Style
Hogarth rig Hogarth rigged dive gear.
Hogarth rigged A method of rigging your gear for maximum survivabililty.
homebrew mix, especially nitrox, brewed up at home, or by adding oxygen to a cylinder and then taking it to dive store for fill. Implicated in a number of fatalities.
hookah regulator for breathing surface supplied air, either from a tank or a compressor, typically down to about 30 feet.
hoover air hog
horsecollar the old style floatation device (now BC).
HP hose High Pressure Hose. Goes from 1st stage to air pressure gauge.
hydro Hydrostatic testing for tank integrity




I IANTD International Association of Nitrox and Technical Divers
inflatable Generally means a RIB.
incident pit Series of events which individually would not be dangerous, but each causes a problem, which is increased by the next, until you have a major incident.
The incident pit is a conceptual 'pit' with progressively steeper sides. Anything going wrong pushes you slightly further into the pit. As the sides steepen, it gets progressively more difficult to get out. British. See clusterfuck.
ingassing Taking on additional nitrogen (and/or other inert gases).
instroketor Instructor who perpetuates strokery by instilling in students his own defective attitudes and techniques.
IP Intermediate Pressure, i.e. the pressure between the first and second stages
isolating manifold manifold that also has a valve to isolate the two tanks, to preserve half the gas supply in the event of a failure.




J Jersey reel A large spool designed to hold ¼ diameter sisal line. Used in conjuction with a lift bag.
Jon line 6-8 ft. line used to attach diver to anchor/shot line for deco so you donΉt wear your arms out. Named for Jon Hulbert, a well-known NE wreck diver.
J-valve Old fashioned tank valve with a reserve lever, which signals that pressure is down to 300-500 psi by making breathing difficult. Often seen with reserve feature disabled on old steel 72s.




K K-valve Regular tank valve
kelp crawl Strange motion used to get over kelp on the surface.
kit (Dive) Gear. British.




L legal bugs Vs. shorts. Lobsters that are long enough to be taken, and do not have eggs on them.
lift bag A device which you attach to an object you would like to lift off the bottom. Shaped like a upsidedown garbage bag, you pump air into to raise your object.
loot and scoot Wreck diving in the Great Lakes.
LORAN Long-range Navigation.
A radionavigation system using land-based radio transmitters (operated in the United States by the USCG) and receivers to allow mariners, aviators, and (more recently) those interested in terrestrial navigation to determine their position.
Highly accurate (better than 0.25 nautical mile (NM) absolute accuracy in the defined coverage area), available (99.7% availability), 24-hour-a-day, all-weather radionavigation system. Loran-C (the present version of this system) coverage extends over the conterminous United States, portions of Alaska, and many other areas of the world.
Source: LORAN-C Users Handbook
Less accurate (for absolute position) than GPS, but cheaper, and universally installed on U.S. boats. LORAN is still more accurate for returning to a prior position (such as a wreck.)
Lorraine Smith Effect pulmonary O2 toxicity
LP hose Low Pressure hose. Goes from 1st stage to 2nd stage or to inflator.




M manifold plumbing to connect to tanks so that one regulator can access the gas in both. See isolating manifold
MARES Diving equipment manufacturer.
mix [noun] mixture of gases, often a trimix
MOD Maximum Operating Depth for a mix, given a maximum ppO2.
MOD = (max ppO2 / fO2 - 1) * 33 fsw





N NACD National Association for Cave Diving
NAUI National Association of Underwater Instructors.
Not Another Underwater Idiot.
Need Another Underwater Instructor.
NDL No-Decompression Limit
NDS No Decompression Stop - no decompression limit according to table or computer
NED Network of Egghead Divers. See information on rec.scuba
newbie Some one new at diving, computers or anything else.
nitrox Any mixture of nitrogen and oxygen. Nitrox 32, Nitrox 36, Nitrox 50, Nitrox 80, etc: Nitrox with 32%, 36%, 50%, and 80% of oxygen respectively.
Nitrox I Nitrox 32. The NOAA term, the term Nitrox 32 is more precise and therefore preferred.
Nitrox II Nitrox 36.
NSS-CDS National Speleological Society-Cave Diving Section




O O2 clean Clean enough of combustibles such as oil to allow use with high pressure O2.
ocky Octopus (British)
OCN Obnoxious Clueless Newbie.
octo Octopus
Octopus Extra second stage regulator, for benefit of your buddy should they want to use your air.
offgassing Reducing the load of nitrogen (and/or other inert gases).
OMS Ocean Management Systems, an equipment vendor well known for their low pressure steel tanks, and also unfortunately for their bondage wings.
OOA Out Of Air
OS O.S. Systems, Inc., Shell dry suit manufacturer. See also this unofficial site.
outgassing Offgassing
OW Open Water. The lowest level of PADI certification for scuba diving.




P P Pressure
PADI Professional Association of Dive Instructors.
Put Another Dollar In.
Pay And Dive Immediately.
Patches Available During Instruction.
Produce Another Dumb Instructor.
Patch and Dollar Industry.
Patches And Decals Included.
Pissed-off Another Dive Instructor.
The largest certifying agency in the U.S.A.
PDIC Professional Diving Instructors Corporation. Certifying agency.
PFO Patent Foramen Ovale, openable flap between atria. See ASD. A shunt between the right and left side of the heart that allows some blood to circulate back through the body without going to the lungs first. This means that micro-bubbles don't get removed from the blood stream by the lungs efficiently, making DCS more likely. 1in 4 people have a PFO.
Paul Bert Effect CNS O2 toxicity
NOAA - CNS oxygen toxicity exposure limits
ppO2 (Bar)
Exposure Limit per dive (min)
Exposure Limit per day (min)
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.7
45
120
150
180
210
240
300
360
570
150
180
180
210
240
270
300
360
570
PDC Personal Dive Computer (British)
persuader Any large crowbar, pipe wrench or sledge hammer used for souvenir hunting
pony bottle 15 to 30 cu. ft. tank, typically worn beside main tank, as a fully redundant emergency air supply. See discussion of ponies and Spare Air in rec.scuba FAQ.
pp Partial Pressure. The total pressure of a gas mixture is the sum of the partial pressures of the component gases.
ppHe Partial Pressure of Helium
ppO2 Partial Pressure of Oxygen. Don't go over 1.4 ATA while diving, or over 1.6 ATA while decompressing.
ppN2 Partial Pressure of Nitrogen
pretzel as in bent as a pretzel. Very bent, doubled over in agony.
primary In a Hogarth rig, the regulator with the long hose, wrapped around the canister light on the right of your harness belt, up to the left of your head, around your neck and into your mouth.
psi pounds per square inch. psi / 14.50377 = bar.
P weight Weight designed to fit in the gully of a standard backplate.




Q



R reduce the signal-to-noise ratio Write useless verbiage (noise), thereby reducing the proportion of useful postings (signal) to useless postings (noise).
RIB Rigid Inflatable Boat, solid keel and large inflated tubes. (British)
riding the hook Hooking up to a wreck by handing a diver the anchor and chain and said diver jumping over and riding it down to the wreck. Used for small/low-profile wrecks.
rolling a tank Tumbling a tank to remove internal corrosion.
Rule #1 Don't dive with strokes. (Hogarthian)
Rule #2 Don't listen to strokes. (Hogarthian)
Rule of Thirds Air - a third to get there, a third to get back, and last third belongs to your buddy.




S SAA Sub Aqua Association. The thorn in BSAC's side, and the only thing stopping them from gaining world domination (well, err...in the UK at least).
SAC Surface Air Consumption. SAC = At Depth Air Consumption At Depth Absolute Pressure See Estimating Gas Consumption, by Larry "Harris" Taylor, Ph.D.
S.A.F.E. PADI training acronym: "Slowly Ascend From Every dive". Alt: "Submerge And Forget Everything".
safe second Octopus.
SAR team Search and Rescue Team
Scooter DPV.
SCUBA Self Contained Underwater Breathing Apparatus. Contrast with SCBA, used by firefighters, which is similar but not intended for use underwater. Also compare with surface supplied air. Scuba is generally used to mean open circuit scuba, as opposed to closed or semi-closed circuit rebreathers.
SD Short for "Spare Death", a slur on the brand name Spare Air. A can of air that is too small to get you to the surface in a real emergency. See discussion of ponies and Spare Air in rec.scuba FAQ.
sea lice Yucky rash, actually caused by larvae of thimble jellyfish larva, getting trapped in bathing costume/lycra etc. and stinging. The larvae almost invisibly small. Sea Lice or Seabather's Eruption, according to which "any rash needs a thorough evaluation to rule out possible communicable causes", which also has detailed instructions for treatment.
second In a Hogarth rig, the regulator under your chin.
serious bandwidth-damage Posting of lots of stupid messages.
set the hook To make sure that the wreckhook is securely fastened to the wreck. Usually done by the first person down.
shoot a bag To send a liftbag up with a line attached for a floating deco.

silt-out Complete loss of vision caused by silt being disturbed, typically by careless finning.
SI Surface Interval (between dives)
six-pack/fast boat Small, open diveboat. Passengers generally limited to not more than six - ergo 6 pack. In the USA a licensed captain can operate a boat carrying up to 6 paying passengers without the boat undergoing the rigorous inspection required of vessels that carry more passengers. Most dive boats tend to be either six packs less than 25 feet long or cattle boats of more than 40 feet. The six packs still have to be seaworthy and must carry certain safety gear, they just don't have to meet all the requirements that cruise ships do.
skin Lycra for warm-water wimps.
sled Wooden board you hold onto while being dragged by a boat.
sling [bottle] Stage bottle.
slobitus DCS skin hit (called that because it originates in fatty tissues).
sloppy Snotty (New York/New Jersey).
snotty Rough sea conditions. In the Northeast, this means 14 foot seas. In Cozumel, it means 2 inch seas.
SMB Surface Marker Buoy. Buoy with flag (on a line to diver). (British)
SOB Same Ocean Buddy
shot line A weight with line and buoy attached to mark the location of a wreck. Used primarily by european divers.
'sorb Stuff in a rebreather to absorb the carbon dioxide you breathe out. Adsorbent.
souvenir To remove items from a wreck.
SPG Submersible Pressure Guage
spring straps Stainless steel springs used to hold your fins on your feet.
square dive A dive where you stay at the deepest point for the duration of the dive.
stab stabilizer jacket, or BC (British).
stage bottle A separate gas supply which is detachable from the diver.
steel 72 Somewhat old-fashioned tank. Nominal capacity 72 cu. ft.
stop if it weren't for the honor of the thing, the safety stop would be a deco stop
stroke (1) diver who's so clueless that he/she is a danger to him/herself and anyone nearby. Often considered an accident looking for a place to happen.
stroke (2) Diver who refuses to learn even when shown a better way.
stroke (3) Favorite insult of Hogarthian divers at WKPP.
stroke mix WKPP divers believe that 80/20 is a bad idea, and refer to it as "stroke mix".
strokery The practices of a stroke.
squidgie A RIB. (British)
suicide clips A type of brass clip with a springed gate notorious for trapping lines and killing divers.




T tag line Granny line.
tank bottle
tech also tek, tekkie, techie, and cowboy
Techdiver Salute A raised fore-finger indicating all is well.
thermocline Boundary between layers of water of different temperatures.
tie in To attach the wreck hook to the wreck with a separate line.
top-to-bottom Underwater vis so good you can see the wreck from the surface.
towfish Side-scan sonar transducer. Towed in water behind boat.
tox Slang for central nervous system oxygen toxicity that can happen when diving too deep on air or diving deeper than you should on an enriched air (nitrox) mixture. Also called the Paul Bert Effect, but tox is easier to remember and lots easier to type.
travel mix Mix such as 50/50 used to travel to or from the bottom. Travel gas is used to get down to the point where depth indicates that you must change to your bottom mix, and then to get up from that point to where you can switch to your deco mix(es).
trimix Breathing mix of three gases, typically oxygen, helium, and nitrogen. Composition is quoted as percentage of oxygen / percentage of helium, e.g. 17/50 is a trimix with 17% oxygen, 50% helium, balance (33%) nitrogen.
tumble Clean tanks of internal corrosion, by filling them with an abrasive such as ceramic chips or aluminum oxide, and leaving on a machine that rotates them for several hours.
TUP Transfer Under Pressure. A TUP system mates a portable compression chamber to another chamber to transfer a person under pressure from one chamber to the other.
Tupperware Large plastic containers wreck divers use to haul all their gear.




U undeserved hit DCS occuring despite staying within table or computer limits.




V vaporware Software that has been announced, but does not yet exist. Often pre-announced for marketing reasons, to discourage users from purchasing a real, shipping, competitive product.
VIP Visual Inspection Program. Testing tank for integrity by visual inspection of insides.
viz Visibility. As in "viz was great - 15 to 20 feet" (North East wreck diver), or "viz was disgusting - 50 feet" (Florida tourist diver).
V weight V-shaped lead weight designed to fit between your tanks behind your backplate.




W wah-wahs Extreme form of nitrogen narcosis (and possibly oxygen toxicity), described in Cautionary Tales.
weight retainer Small metal or plastic device used to keep lead weights from sliding, among other things.
wet Means more to us than just moisture present.
whip Adapter to fill tanks from O2 or He bottles.
WKPP Woodsville-Karst Plains Project
WPB West Palm Beach
wreck hook An anchor with bendable tines, also called a grappling hook.




X



Y y valve Tank valve with two outlets.




Z zodiac A RIB.