Air Bladder (Subnautica)

The Air Bladder is a flotation device. It allows players to reach the surface of the water faster than just swimming to the surface.

Air Bladder is found in the Equipment list in the Fabricator and can be equipped to the Toolbar.

Uses
Once equipped the player can use the Air Bladder to ascend quickly to the surface. This is a great device if you find yourself running out of oxygen or need to use it to escape away from dangerous creatures. Pressing the right mouse button (RMB) (after selecting it from the toolbar) will inflate the bladder causing the player to ascend. Once at the surface players must use the right mouse button to deflate the air bladder. It is impossible to swim down into the ocean with the bladder inflated.

Speed
A number of tests were run from the depth of 50 meters to determine the speed of swimming to the surface with flippers verses using the air bladder. With flippers, players will average 4.16m/s or 12 seconds to ascend from a depth of 50 meters. With the Air Bladder, players will average 6.25m/s or 8 seconds to ascend from a depth of 50 meters. (This is also assuming that ascending occurs at the same speed in all biomes.)

Gallery
From top to bottom, the Air Bladder in its neutral state, the Air Bladder inflated, and the Air Bladder being deflated at surface (must be done in order to swim back down into the ocean).