Off the top of my head, rope to put down Gide lines in case you get silted out so you have something to follow to get out.
Also extra everything, if your open water diving and you run out of air (or other critial equipment failure) you can roll the dice on the bends by going straight to the surface, not so with cave diving; your just going to drown.
+1 bazzite as well. It comes with waydroid for android apps, its Linux (so WSL covered), it does have a gaming focus, it has various Virtualization tools (toolbox, box-buddy) but you can get other options depending on what you actually want.
Don’t like it you can rebase to one of the other ostree based images from uBlue or fedora with about one command and a reboot.