Included is a long sequence showing the submersible being launched and retrieved by it's mother ship. Also, underwater shots of Deepquest. The apparent speed-up in the movements of small marine animals sometimes creates comical effects. Sea urchins, sea cucumbers, starfish, etc. appear to be racing across the ocean floor. One starfish appears to hit another.
Crabs push starfish aside in the process of devouring a dead fish, etc.
Included are scenes of undersea avalanches, implosions, explosions, red-hot lava flowing underwater and a diver being struck by hot lava. The film demonstrates the origin of pillow lava. It also includes scenes of an erupting volcano and lava flows above water. Additional footage is available on volcanic activity and lava flows both above and under water. Curious fish observe the bubbles.