GRALmarine ROV – the Deepest Underwater Cave Discovered

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October 1, 2016 at 7:03 pm #7343

Grynda
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Hello!
GRALmarine ROV reached on Tuesday, 27th September, 404 m finding the deepest flooden cave in the world, more: http://www.nationalgeographic.com/adventure/activities/caving-and-canyoneering/deepest-underwater-cave-discovered/
Hranicka Propast is the depth record holder right now.
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