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- Season 0 1999-07-13
- Season 1 1974-03-03
- Season 2 1974-11-03
- Season 3 1976-01-04
- Season 4 1977-01-05
- Season 5 1978-01-04
- Season 6 1979-01-04
- Season 7 1980-01-15
- Season 8 1981-01-06
- Season 9 1982-01-10
- Season 10 1983-01-18
- Season 11 1984-01-17
- Season 12 1985-01-15
- Season 13 1986-01-21
- Season 14 1987-01-20
- Season 15 1988-01-19
- Season 16 1989-01-17
- Season 17 1990-01-09
- Season 18 1991-01-08
- Season 19 1992-01-14
- Season 20 1993-01-05
- Season 21 1994-01-18
- Season 22 1995-01-08
- Season 23 1995-10-10
- Season 24 1996-10-01
- Season 25 1997-10-07
- Season 26 1998-10-06
- Season 27 1999-10-05
- Season 28 2000-10-24
- Season 29 2001-10-02
- Season 30 2002-09-03
- Season 31 2003-09-30
- Season 32 2004-09-28
- Season 33 2005-09-20
- Season 34 2006-09-05
- Season 35 2007-10-09
- Season 36 2008-10-07
- Season 37 2009-10-06
- Season 38 2010-10-19
- Season 39 2011-09-07
- Season 40 2012-10-10
- Season 41 2013-09-11
- Season 42 2014-09-10
- Season 43 2015-09-16
- Season 44 2016-09-07
- Season 45 2018-01-10
- Season 46 2019-01-02
- Season 47 2020-02-05
- Season 48 2021-01-13
- Season 49 2022-02-01
- Season 50 2023-02-01
- Season 51 2024-01-31
Season 51 Episode
- Season 43 Dawn of Humanity
- Season 43 Arctic Ghost Ship
- Season 43 Secrets of Noah's Ark
- Season 43 Cyberwar Threat
- Season 43 Animal Mummies
- Season 43 Making North America: Origins
- Season 43 Making North America: Life
- Season 43 Making North America: Human
- Season 43 Inside Einstein's Mind
- Season 43 Secret Tunnel Warfare
- Season 43 Life's Rocky Start
- Season 43 Mystery Beneath the Ice
- Season 43 Himalayan Megaquake
- Season 43 Creatures of Light
- Season 43 Memory Hackers
- Season 43 Iceman Reborn
- Season 43 Rise of the Robots
- Season 43 Vikings Unearthed
- Season 43 Can Alzheimer's Be Stopped?
- Season 43 Wild Ways
- Season 43 Operation Lighthouse Rescue
- Season 43 Bombing Hitler's Supergun
NOVA - Season 43 Episode 12 Mystery Beneath the Ice
6.80 55 minutes Tiny, transparent, and threatened, krill are crucial to the Antarctic ecosystem. But the population of krill is crashing for reasons that continue to baffle the experts. A leading theory says that krill’s life cycle is driven by an internal body clock that responds to the waxing and waning of the Antarctic ice pack, and as climate change alters the timing of the ice pack, their life cycle is disrupted. To test it, NOVA travels on the Polarstern, a state-of-the-art research vessel, to the frigid ice pack in the dead of winter. From camps established on the ice, scientists dive beneath the surface in search of the ice caves that shelter juvenile krill during the winter. There, they hope to discover what’s causing the krill to vanish and, ultimately, how the shifting seasons caused by climate change could disrupt ecosystems around the world.
