Board Thread:Online Discussion/@comment-58.178.252.200-20131023111131/@comment-64.18.111.33-20131114140020

They removed it because there will be no under water in ESO right now its just swimming on the surface of bodies of water so breathing underwater would just be a completely useless skill. Though both are those are subject to change as they actully listen to their players. So if your planning on playing TESO and want both of those added in start gatherign community votes for them.