I need to know the volumes of gas created when igniting underwater
explosives, looking for 3 examples @ $15.00 each.  I need a cost
effective way to repeatedly make "ballast" on the sea floor.  Other
methods would also be considered.

---

Clarification of Question by dancehalldoug-ga on 23 Oct 2004 01:27 PDT

I need to expel water from an open bottomed cylinder by forcing gas
into it.  ( 3ft. X 5ft.)  I know the deeper, the more reaction I need.
 I need math.  ex: 1 lb. of TNT = 100 cubic feet at sea level, 10
cubic feet at 20 ft below sea level.
Ref:    dancehalldoug.com/sdougsea.mpg

I'm not sure what you mean by "making ballast" - I'm thinking of rocks
or bags of sand, but I can't tie that to volumes of gas.  Regardless,
you'll need to specify the depth of water where the explosions are.

Ian G.

I think that compressed air is usually used for this purpose, rather
than explosives.