1x1 - Ten Minutes of Eternity

September 15, 1971

Debut: In the premiere episode a man (Chris Robinson) seeking to steal a new invention by Primus' sidekick is thwarted when his two man sub gets trapped when a mining explosion causes an underwater rock fall. The new invention is a robot that allows mining at up to 350 feet below sea level depth. With the aid of the new robot, Primus rescues the would be thief.

1x2 - Deepest of the Deep

September 22, 1971

1x3 - Trial and Terror

September 29, 1971

1x4 - Kiss of Life

October 7, 1971

1x5 - Underwater Getaway

October 21, 1971

1x6 - The Phantom Horse

October 28, 1971

1x7 - Bearer of Light

November 3, 1971

1x8 - Oil Rig

November 10, 1971

1x9 - Breaking Point

November 24, 1974

1x10 - The 65th Minute

December 1, 1971

1x12 - Blade of Fire

December 8, 1971

1x13 - Tektite #1

December 15, 1971

1x14 - 49 Sharks

December 22, 1971

1x15 - The Sea is Boiling Hot

December 29, 1971

1x16 - Death Tide

January 5, 1972

1x17 - Sea Serpent

January 12, 1972

1x18 - The Sniper

January 19, 1972

1x19 - The Steel Fish

April 21, 1972

1x20 - Black Diamonds

April 28, 1972

1x21 - Infrared

May 5, 1972

1x22 - Nuclear Black Market

May 12, 1972

1x23 - The Black Hole

May 19, 1972

1x24 - Trapped, Part One

May 26, 1972

1x25 - Trapped, Part Two

June 2, 1972

1x26 - The Net

June 9, 1972