The boundaries for tag can be the whole pool, part of the pool (the shallow end) and even the areas surrounding the pool. In this version of tag, one person is "it" and attempts to tag any of the other players, but when they touch someone, that person is "frozen" in place. They cannot move and must stand with their feet apart. The only way they can become unfrozen is if another person crawls under their legs (if they are outside of the pool) or swim between their legs (if they are inside of the pool). If a player is tagged in the deep end, they must tread water until someone swims completely under them through their legs. Play continues until all the players are frozen. Then the last person to be frozen is "it" for the next game.