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Season
- Season 1 1999-04-12
- Season 2 1970-01-01
- Season 3 1970-01-01
- Season 4 2002-01-01
- Season 5 2003-05-11
- Season 6 2004-04-12
- Season 7 2005-01-01
- Season 8 2006-01-01
- Season 9 2007-01-01
- Season 10 2008-01-01
- Season 11 2009-08-15
- Season 12 2010-02-23
- Season 13 2011-10-06
- Season 14 2012-08-17
- Season 15 2013-01-01
- Season 16 2014-03-30
- Season 17 2015-01-10
- Season 18 2016-01-09
- Season 19 2017-01-15
- Season 20 2018-01-14
- Season 21 2019-01-20
- Season 22 2020-01-18
- Season 23 2021-01-04
- Season 24 2022-01-23
- Season 25 2023-01-22
- Season 26 2024-01-21
Season 26 Episode
- Season 21 Orcas: Mysterious Gathering at Shiretoko
- Season 21 The Choshi River: Seeing the Unseeable
- Season 21 Tokyo's Lost Islands: Minami Iwo-to
- Season 21 Tokyo's Lost Islands: Sofugan
- Season 21 Rescue Triage: Learning from Disasters
- Season 21 Black Tsunami
- Season 21 Aurá: Last Survivor of An Unknown Tribe
- Season 21 Decommissioning Fukushima Daiichi: Tackling Nuclear Fuel Debris
- Season 21 Nobel Laureate Salaryman: Staying Ahead in Science and Technology
- Season 21 Yui and Bailey the Therapy Dog
- Season 21 New Roles in a Changing World: The Japan Self-Defense Forces
- Season 21 AI Robots: Friend or Foe?
- Season 21 US-China Tech War
- Season 21 From Despair to Recovery: The Era of Regenerative Medicine
- Season 21 Who Will Protect You? Global Warming Unleashes Torrential Rain
- Season 21 A Right to the End
- Season 21 Death of a Dream: Vietnamese Workers in Japan
- Season 21 Han-gure: An Emerging Threat to Society
- Season 21 Hyakumikai: A Rare Glimpse into Kyoto's Inner Parlors
- Season 21 A New Peace Memorial Museum: Passing on Hiroshima's Message
- Season 21 The People and Their Emperor
- Season 21 The Fall of Freedom - How a newspaper led Japan to war
- Season 21 The Great Metropolitan Blackout: Preparing for Crisis
- Season 21 Death Doulas for Businesses: End-of-Life Care for Dying Companies
- Season 21 The Words of Emperor Showa: Records of Imperial Audiences
- Season 21 The Supreme Imperial Collection: The Shosoin Treasures and the Birth of Japan
NHK Documentary - Season 21 Episode 2 The Choshi River: Seeing the Unseeable
0.00 57 minutes In Japan, many rivers are known for their clear, beautiful water. But the Choshi River is so free of dirt and sediment that you can "see the unseeable." Creatures and plants far below the surface that would not be visible in other rivers can easily be viewed. What's the secret behind the Choshi's amazing clarity? Join us as we explore the geology and ecology of this remarkable river.
