Breathing Reed

The Breathing Reed is an item that can be found in water chests. When held, a reed will appear above your character, making him/her able to breathe when the reed's end is above the water instead of them. It also causes your breath to decrease half as fast. The downside to using it is that you need to keep it held, so you can't fight, dig or do anything else when using it. Keep in mind, if the end of the reed hits the inside of a block rather than air, it does not recover your breathing meter. An easy way to obtain one of these is to check the Ocean on both sides of the map.