Former chainsaw operater speaking. I cant imagine easily using a chainsaw underwater for the every action has an equal and opposite reaction thing. However, I notice that the front spikes on the saw are noticably big. When these are dug into the timber, they offer a fulcrum using which the operator can apply force onto the timber. This could lessen though not negate the issue.

I gave up chainsawing the day I accidentally sawed through my boots. Just that morning I had put on a pair of steel toecap boots for the first time. Saved my toes.

It's so no matter what they know they'll win any followup lawsuits hah!

'Your honor, our manual clearly stated to maintain proper footing and balance at all times, which the diver clear did not do, resulting in his unfortunate death when our tool exploded and severed his air line. We move for summary dismissal.'

Industrial work underwater is commonly done in weighted, metal booted diving suits you stand and walk in, rather than finned frog man type suits.

I'd guess that if you're cutting something with a chainsaw underwater, they expect you to be standing on the bottom of the body of water.

It doesn't sound like it's meant to be used in very deep water, since it's intended for cutting through wood:

> The Stanley line of underwater chain saws are designed for cutting all types of wood structures including bridge pilings, pier and dock timbers. All chain saw models include an interlocking safety trigger with hand guard and stainless steel spool and fasteners.

There's a photo of it being used, but it's very unclear what's happening: https://www.stanleyinfrastructure.com/sites/default/files/pr...

I can't imagine what the kickback would be like if you weren't secured when using one of these. I've never used one of these, but I imagine you would need to be braced against something when using it.