Explore submerged ruins and swim beneath a thick sheet of ice in this breathtaking glimpse into the world of freediving. https://on.natgeo.com/2EYQPuV #WorldOceansDay

Explore submerged ruins and swim beneath a thick sheet of ice in this breathtaking glimpse into the world of freediving. https://on.natgeo.com/2EYQPuV  #WorldOceansDay

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