Let me start this off with stating that I know that you're not EXO, however this is simply a suggestion from a mission that EXO used for their Tanoa server, which I believe can do wonders on the new Isla Abramia map.
They had an "Underwater Stash" or something like that. It was 2 subs underwater packed full of loot and poptabs with a shit ton of AI surrounding them. Obviously you needed a rebreather and a SDAR to complete the mission. It was a mission that was fought over many times over. I figured, with the way Isla plays, this would be awesome to have. Having those weird/random underwater fights w/ other players was crazy.