Overview
One salvage diver disappears while diving on a sunken yacht off the coast of Yucatan, and Mike tries to see that two others don't share his fate.
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4 - 1Point of No Return January 07, 1961 -
4 - 2River Treasure January 14, 1961
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4 - 3The Destroyers January 21, 1961
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4 - 4Vital Error January 28, 1961
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4 - 5The Dancer February 04, 1961
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4 - 6Sperling of Lamatsue February 11, 1961
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4 - 7Rescue February 18, 1961
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4 - 8Mercy Trip February 25, 1961
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4 - 9Hot Tracer March 04, 1961
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4 - 10Sonar Story March 11, 1961
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4 - 11Amigo March 18, 1961
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4 - 12The Aquanettes March 25, 1961
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4 - 13Survival Kit April 01, 1961
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4 - 14Expedition April 08, 1961
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4 - 15Bionics April 15, 1961
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4 - 16The Defector April 22, 1961
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4 - 17Niko April 29, 1961
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4 - 18Cougar May 06, 1961
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4 - 19Sub Hatch May 13, 1961
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4 - 20The Octopus Story May 20, 1961
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4 - 21Quicksand May 27, 1961
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4 - 22Lost Island June 03, 1961
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4 - 23Baby June 10, 1961
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4 - 24Confidential Mission June 17, 1961
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4 - 25Underwater Pirates June 24, 1961
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4 - 26The Meet July 01, 1961
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4 - 27Dark Evil July 08, 1961
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4 - 28Sunken Car July 15, 1961
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4 - 29Hit and Run July 22, 1961
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4 - 30The Saint Story July 29, 1961
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4 - 31Impostor August 05, 1961
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4 - 32Superman August 12, 1961
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4 - 33Roustabout August 19, 1961
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4 - 34P.T. Boat August 26, 1961
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4 - 35Starting Signal September 02, 1961
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4 - 36Skipper September 09, 1961
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4 - 37Crime at Sea September 16, 1961
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4 - 38Round Up September 23, 1961