Swimming is a mechanic in Super Smash Bros. games introduced in Super Smash Bros. Brawl. Characters can swim in areas with water, like the Pirate Ship. If characters swim for too long, they will get tired and drown. When a character begins to drown, it seems like they are splashing about, but frowning or terrified facial expressions. In the Subspace Emissary, most enemies that happens to touch the water will be instantly K.O.'d. The time the characters stay afloat before drowning differs on how much damage they have. While swimming, characters cannot attack and can only move to the left or right and jump out of the water.
Main article, Soaking
Characters like Ganondorf and Wolf can use the water to their advantage. Considering their Meteor smashes frequently can cause them to fall faster and difficult to recover from, they are somewhat used to cause early K.Os. pinning opponents to the water and repeatedly using their meteor smashes will eventually drown the opponent. Why this is useful is because the water mechanism is to lift all players to the surface, the heavier the slower, you can keep floating back upward so if you miss you can try again. Eventually you will push the opponent so far down they will be K.Oed. The key is to keep the opponent at sea, hence the term "Soaking".