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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
up vote 3 down vote accepted

I do light underwater work as a part of my job. One thing I do is drill in rock underwater with a CP9 rock drill. This is a pneumatic tool but is designed to work both above and under water. It works great as long as it is properly lubed before and disassembled and lubed as soon as possible after the job is done.

I have no first hand experience of other tools, but according to a colleague it is perfectly fine to use more or less any pneumatic tools underwater, he often uses cheap ones and says that they do get the job done.

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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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