He was using a piece of apparatus called a rebreather

[Dimitris Galon]

05.11.2011

He was using a piece of apparatus called a rebreather rather than the conventional Scuba gear that most divers rely on, and was descending to the wreck of the Sagheera, a Saudi-registered supertanker that sank and split into two sections 22 kilometres from shore after an on-board explosion in January 1989.
The instructor who taught Mr Hanz how to use the rebreather has travelled over from Germany to search for his remains. Achim Schlöffel, the founder of the international training company Inner Space Explorers, spent several days searching the area where Mr Hanz disappeared with help from members of the Dubai club.

πηγή

31.10.2011

Jarrod Jablonski:

[...]

Yeah, and so think about that and how you would feel if your best friend or your wife was killed in 33 feet (10m) of water using a rebreather. You’d have to ask yourself, “why?” What happened? Does this make sense?

[…]

A semi-closed system vents gas from the breathing loop. So for example with our unit, we have a ten-to-one ratio, so roughly 10 percent of that gas in blown off every breathing cycle and fresh gas is added. So the diver rebreathes some of the gas in the loop, and as a result, there is an oxygen drop from what’s in your gas supply to what the diver actually breathes from the loop and the amount of that drop is greater, the shallower you are. This decline occurs over time and relates to breathing rate, gas vented from the loop and depth, but as a rough example you might see a 10 point or greater oxygen drop in shallow water. So if you’re using 30 percent oxygen, it’s 20 percent oxygen at my mouth. But by the time I get to 300 feet (91m) it’s only a couple of percentage points. For deep diving it’s more or less irrelevant, but for shallow diving it’s pretty important.

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