The ocean depths are explored with the aid of a submarine chamber of Williamson's invention and a few hardy souls. The construction of the device is examined; but most of the footage is given to plant and animal life, a girl swimming among the coral growths, and two divers who encounter a moray and an octopus.
| Actor | Role |
|---|---|
| JJ. Ernest WilliamsonThe Oceanographer | The Oceanographer |