Hi Jay. Both good points. My thought was that the volume per cubic foot of available tank space for air versus CO2 might help in a small sub when the tanks are inside and taking up valuable space.
A standard scuba tank at 80 cubic feet of air takes up quite a bit of space. Now, let me ramble for a minute.
2 people on board, diving at 150 feet, want to blow ballast dry maybe 3 times each dive. ( one to come up, one to try but fail to come up, and one more to come up after you fix whatever it was that failed.) Hopefully you get it right by then.But if it still won't come up........
Now you need two tanks for escape air, and enough air with a scrubber to stay stuck for three days while you hope someone can get to you.
That makes about 6 scuba tanks.
What if you could replace all the ballast blow with one liquid tank, ( 3 blows, or 3 scuba tanks.)
With a small sub, it's getting real crowded in there with all those tanks.
I don't think anyone carries that much air in a small sub, but more is better than less!
Just wondering.Frank D.
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