During gang wars, enemies can spawn under water and survive forever without air. But if they spawn on land and you lure them into a pool of water, they will drown.
This maybe everybody knows: GSF members can swim after CJ have recruited them and only as long as they are under CJ's command. They will lose the ability to swim after CJ disbands the group.
Edited by lil weasel, 07 August 2013 - 10:24 AM.