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diving bell maybe?
Sniper rifle from the surface
Regular bullets fired out of regular firearms basically disintegrate in water. Counter-intuitively, putting more energy into a bullet only worsens the results, making it stop even faster.
Underwater firearms do exist, but they are not common, and even they have incredibly limited range. As far as I know, none have effective range greatly exceeding 50 meters, let alone 100.
Whaaat I didn't know they made those!
*googles
Looks like Russia made one during the Cold War for frogmen firefights (<-wild) At a depth of 15 ft, its effective range was 99 ft!! The deeper you go the worse it gets though, and it totally sucks on land too
Frogmen Firefights
*edit 99 ft, not 909 :(
Every source I can find mentions maximum effective range at 15ft to be ~98 feet, not 909. So that zero in the middle is probably a typo, if I had to guess.