The deep ocean has been successfully conquered by man. The nation's pride lies in America's first self-contained undersea laboratory, which is expected to lead to an elaborate mining operation. However, the discovery of a previously unknown world and its inhabitants was not part of the plan. This film, directed by Mary Ann Fisher and written by Howard R. Cohen and Daryl Haney, stars Bradford Dillman, Priscilla Barnes, and Daryl Haney.