Short20201 min1920×1080

Blue Holes auf den Bahamas (CC BY 4.0)

ZDF/Terra X/SPIEGEL TV/Christopher Gerisch/Tilman Remme/Reiner Bauer, Oliver Gurr/Oliver Roetz, Philipp Klein/Hauke Ketelsen/Richard Sako

At the Wikimedia Commons

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About

Blue holes are cave systems, flooded with sea water. How did the geological treasures develop thousands of years ago?

Archive
Wikimedia Commons, in Wikimedia Commons
Licence or status
CC BY 4.0, as the Wikimedia Commons states it.
Credit
ZDF/Terra X/SPIEGEL TV/Christopher Gerisch/Tilman Remme/Reiner Bauer, Oliver Gurr/Oliver Roetz, Philipp Klein/Hauke Ketelsen/Richard Sako
Who can watch
The archive gives no rating. Invisible Network shows it to Teens profiles and older, judged from its collection and subjects. How films are placed