Season
- Season 0 1984-09-24
- Season 1 1983-10-30
- Season 2 1984-05-06
- Season 3 1984-11-04
- Season 4 1985-09-15
- Season 5 1986-10-05
- Season 6 1987-09-20
- Season 7 1988-09-18
- Season 8 1989-10-01
- Season 9 1991-01-06
- Season 10 1991-11-24
- Season 11 1993-01-03
- Season 12 1994-02-20
- Season 13 1994-11-27
- Season 14 1996-01-14
- Season 15 1996-10-06
- Season 16 1997-10-19
- Season 17 1998-10-11
- Season 18 1999-10-03
- Season 19 2000-10-08
- Season 20 2001-10-07
- Season 21 2002-10-13
- Season 22 2003-10-12
- Season 23 2004-10-14
- Season 24 2005-10-19
- Season 25 2006-10-18
- Season 26 2007-04-04
- Season 27 2008-01-04
- Season 28 2008-11-11
- Season 29 2009-10-28
- Season 30 2010-07-08
- Season 31 2011-08-01
- Season 32 2012-07-19
- Season 33 2013-05-17
- Season 34 2014-04-11
- Season 35 2015-02-24
- Season 36 2016-04-14
- Season 37 2017-03-20
- Season 38 2018-03-31
- Season 39 2019-04-07
Season 39 Episode
- Season 23 Cheetahs: Fast Track to Freedom
- Season 23 Norfolk Broads: The Fall and Rise of a Great Swamp
- Season 23 Typhoon Island
- Season 23 Mississippi: Tales of the Last River Rat
- Season 23 Hammerhead
- Season 23 The Wild Wood
- Season 23 Andes: The Dragon's Back
- Season 23 Land of the Falling Lakes
- Season 23 Echo of the Elephants - The Final Chapter?
- Season 23 Shark Coast
- Season 23 Serengeti 24
- Season 23 Secrets of the Maya Underworld
- Season 23 A Boy Among Polar Bears
- Season 23 Wolf Pack
Natural World - Season 23 Episode 12 Secrets of the Maya Underworld
7.00 60 minutes Beneath the jungle-clad temples of Mexico's Yucatan, a startling discovery has been made: the largest network of flooded caves and underground rivers in the world.
The intrepid cave divers exploring this surreal landscape have made remarkable discoveries: bizarre new animals, as well as the skeletons of the ancient Maya and the offerings they made to the spirits. This was their underworld, and its secrets are finally being revealed.
