i have to agree with obsidian here. i do like the concept of what your suggesting but this just would not be possible at all. in real life bullets not not go more then a few feet underwater and the only real thing that would fly that far are torpedo’s and rockets. i know its a videogame and anything is possible, and i would like to have a mode like this where your vehicle is underwater for raids and whatnot, but its like obsidian said, crossout vehicles arent made for underwater adventures, dont forget alot of their vehicles are made from scrap parts and things found across the wasteland. they MIGHT be able to make a underwater submersible that can go down a few feet at most, or even a drone that could go down a few feet, but a full on vehicle would be impossible.