code/game/turfs/simulated/floor/water.dm

/turf/simulated/floor/water/deep_beach	Deep water drains stamina and starts drowning you
/turf/simulated/floor/water/hot_spring	A special subtype of water with steam particles and a status effect similar to showers, that's however only applied if the living mob inside the turf is actually immersed in it (eg. not flying, not floating).