A snorkel adapter apparatus is disclosed. The snorkel adapter apparatus includes a snorkel tube, a float, a mouthpiece, and a single pivot point. These pieces combined together create a snorkel breathing apparatus that allows the user to submerge the snorkel in water and prevent water from entering the snorkel tube and mouthpiece. When the snorkel is submerged in water, the float rotates around a coupler attached to the pivot attachment point and closes the open end of the snorkel tube. The buoyancy of the float in the water causes it to rotate and seal the snorkel tube closed.