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Cool publicity photo of Navy SEALs emerging in an amphibian assault during training. Note the H&K MP5SDs, which were favored by the SEALs for this exact (admittedly niche) application, not just for being fairly quiet guns, but also because the gun could still be safely fired even as there was still water remaining in the gun, still draining.
This is not something you can do with an AR15, as the gas tube or bolt carrier being full of water (which does not compress), will cause the gun to explode. This can be avoided by just waiting a second or two for the gun to drain its water, made faster by pulling the bolt back partway, and having a drain hole drilled in the bottom of the buffer tube isn't a bad idea. Still, with a gun like the MP5SD you don't need to do this, and being 9mm Luger can be subsonic, unlike 5.56mm NATO which is always supersonic, and does not really suppress well (for the purposes of stealth, anyway).
I think I'll blow through No Rest For The Living on UV as a refresher, I've gotten pretty rusty from not playing in a couple months, it should be short, but challenging. I'll throw on that .midi pack those dudes on Doomworld made, and maybe also some texture pack.