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My neighbor is restoring a house built in 1906. He's got a lot of vintage things including this 1938 Wurlitzer jukebox. It plays 78 speed 9 inch singles. It was the first year of the Bakelite Plastics light up components on the exterior.
Who's the guy running the heavy equipment business here?
I believe you're looking for SixShooter.
Just a guess, but I'd say that if you were to remove the engine and extend the main hydraulic lines up to a barge on the surface, there shouldn't be any reason why you couldn't drive and operate an excavator under water.
Edit: found a video of exactly that. Not the same one, but looks like the concept I was envisioning:
Location: Detroit (the part with no rules or laws)
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This thing looks like a fully operational above ground / surface unit. A couple of comments say it is a "sacrificial" unit used by the oil industry or something. Judging by the growth on it, it's been down there a while.
I don't have any good pictures, so here is me in a very dark and wet(yeah it's acid) hole repairing some bussing that had shorted out.
Looks like an old Caterpillar 320BL with the engine, cooling, and hydraulic pumps removed working with an umbilical set of hydraulic lines up to the power unit on a barge. Pretty cool.
We don't do that but we do have biodegradable hydraulic oil for aquatic work for some of our machines.