Barrier Reef Episode Guide Air Date Synopsis 09/11/71 Joe must catch a deadly stonefish to provide an antidote for a stricken Captain King. 09/18/71 A diver seeks revenge against a shark that attacked him. 09/25/71 The Endeavor crew searches for a priceless cannon that is lodged in a sunken wreck. 10/02/71 The crew attempts to save Steve, who has been trapped in an underwater cave in. 10/09/71 The Endeavor crew tries to find out why Russian divers are in the Barrier Reef. 10/16/71 The crew investigates the source of mysterious radioactive signals. 10/23/71 The crew of the Endeavor looks for survivors after a cyclone causes destruction on the North Queensland Coast of Australia. 10/30/71 The crew attempts to raise a sunken galleon that may contain cargo worth $3 million. 11/06/71 A search for hidden pearls causes an underwater spear gun fight. 11/13/71 Members of the Endeavor fight a giant sea turtle. 11/20/71 The crew searches for a treasure of gold coins worth a fortune. 11/27/71 The crew finds a missile embedded in the coral reef. 12/04/71 While working underwater, two coral poachers learn of the danger of the bends. 12/11/71 The crew looks for a mine that was planted in the Barrier Reef during World War II. 12/18/71 Radioactive infections imperils a scientist. 12/25/71 Kip becomes trapped in an underwater sonic fence. 01/01/72 Pre-empted 01/08/72 The crew looks for a radioactive cylinder that has been lost in the Barrier Reef. 01/15/72 - on Reruns