If you use lazurus chowder it will slow how fast you take oxygen. 1000 oxygen will last about 10 min while chowder is in use. Very fast and small, and if you pack chowder a very good Diplo can last hours before needing to surface.
Can ride but only underwater. In order to ride, hold whatever your ride button is and click the option that says ride. Level up in oxygen, health, and movement speed if using this for underwater dives. Really fast underwater, and can outspeed megalodons.