code/game/turfs/open/water.dm 
/turf/open/water/deep_beach | Deep water drains stamina and starts drowning you |
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/turf/open/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). |