Prominent scientists Dr. William Beebe and Otis Barton, using the Bathyspere invented by Barton, descend several thousand feet to the ocean floor off of the shores of Bermuda to study and film sea creatures seen and filmed at that depth for the first time. A sometimes staged semi-documentary that was often sold and advertised as an exploitation/horror picture.

"Brave and beautiful girl scientists... facing death in the ocean's depths... battling fierce sea demons... men and monsters in deadly combat... the dangers met and conquered by science!"