SSBWRWP
That's abbreviated for "Sinking Ship but with realistic water physics"
It's basically sinking ship, but the rooms can be flooded individually
Maps right now are:
Cruise Ship
Classic Ship (cruise ship but more blocky)
Cargo Ship (at least i think thats what it was called)
Aircraft carrier
Submarine
The submarine map has scuba gear located in the entrance room and the mini-sub room, which you can put on to become fully immune to water.