it's really hard on the motor. The magnets are ferrite and will rust. The motor core is iron. All of the fasteners and springs are carbon steel which rusts.
I think the gas gun would fare better as it doesn't have a motor, but the springs and fasteners would rust.
Come to think of it, you also would get some interesting electrolytic effects at the battery connector and switch gear where the voltage differential is high. 8.4v/9.6v across a small gap so you'd get a little electrolysis which would corrode things really fast. A bit of electrolysed hydrogen and oxygen electrochemistry wouldn't cause a fire or anything (far too little production) but it'd degrade the metal contacts and switchgearsignificantly in about an hour.
It would be better to put the gun in a heat sealed bag and shoot through the bag after surfacing or join the army and do it with the real thing.
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