What? Doing a little rebreather research, I came across a pretty interesting site: http://www.therebreathersite.nl/03_Historical/cryo_pjotrr.htm. Basically, in the 60's NASA started experimenting with using liquid oxygen and liquid nitrogen to make breathing air. Think of having a huge amount of gas (in the form of liquid) with you for a dive. You are breathing the "boil off" as the liquid gases are warmed up. Some folks say the system could easily provide about 5 hours of air at 33' without a weight increase from standard scuba.
I guess filling it would be the only downside. :-). It looks like rebreather folks have been thinking about how to do this for a while as well and have even built rebreathers that use liquid oxygen and then scrubs the carbon dioxide out by using the cold from the liquid oxygen to freeze the CO2 out. Pretty interesting stuff - for a dive geek. Greg
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