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I have a concrete that is stuck underwater. The concrete piece is too heavy. I think that I could break it into small pieces with my pneumatic impact drill.

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How deep is the water? Would the whole tool be submerged, or just the chisel? – Doresoom Jun 13 '11 at 22:07
Check these out Hydraulic Tools. – Tester101 Jun 14 '11 at 12:38
It' 8 feed underwater. It's close to my dock. I can try to use a giraffe jack, one of 2"x6x8' with 2 chains. I will jack the piece with the jack and a chain than tight the second chain with the 2"x6". I lower the jack and retight the first chain. Repeat until the piece of concrete go out of the water. I will try to move or break it outside. – Nadzzz Jun 14 '11 at 14:19

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Simple answer: NO! Any stoppage of outgoing air will suck water into the exhaust , cause hydolock, probably seize up and ruin your tool. Can you get bit extensions so the tool body is not underwater? That would work.

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Seems that everybody says NO, but scuba divers seem to say they've done it check this out (might be a load of crap, but I found more than a few folks who say they've done it). I wouldn't try it, but I thought it was interesting that some people have. Please don't try this at home (I just found it amusing that folks even thought to try this). – Tester101 Jun 14 '11 at 12:32

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