The minecraft dolphin mobs. One of them you control and the other one tries to follow and match altitude with you. The highest jump I have gotten is 400 feet out of the water but I have not been able to recreate it. It is best to use the Underwater camera mod. It is a VERY unstable craft and sometimes they blow up at the slightest touch.

How to use

Throttle up to start swimming immediately as you load into the level. Adding even a tiny amount of buoyancy to the dolphins made it a struggle to get to the surface for some reason. They sink quickly. The dolphin controls like a plane underwater with added yaw. Pitch up is MUCH faster than pitch down. Its very easy to get stuck on terrain so don't go near it. FireGuns makes a green line in the direction of the 2nd dolphin. It sometimes gives readings in the opposite direction when they are far apart. If they get too far away jump out of the water, the other one will copy the jump and you should see it.

Controls

Throttle - swim
roll, pitch, yaw - the same
FireGuns - locate 2nd dolphin

Gifs

swimming and using locate 2nd dolphin

jumping