Swimming

Swimming is a movement mechanic in various Call of Duty titles. It is most prominent in Call of Duty: Ghosts, Call of Duty: Advanced Warfare, and Call of Duty: Black Ops III.

Call of Duty: Ghosts
Swimming is seen in the levels "Atlas Falls" and "Into the Deep", the majority of the two levels is placed underwater, making swimming the only way to traverse the level. The player is limited to the APS Underwater Rifle and Combat Knife in the level.

Call of Duty: Advanced Warfare
Swimming is a mechanic available to the player in various levels and multiplayer maps. In the map Defender, the player can swim on one end of the map, especially once the tidal wave has struck the map.

Call of Duty: Black Ops III
Swimming returns in Black Ops III. Players are now able to fire their weapons underwater, however, whether there is an attachment or weapons are by default able to is unknown.