November 20, 2014

Ocean Blue Hole, Bahamas

Photograph by Jad Davenport, National Geographic

Divers explore an underwater cave system on Andros Island in the Bahamas. Offshore flooded caves, called ocean blue holes, are extensions of the sea, subject to the same heavy tides and host to many of the same species found in the surrounding waters. The blue holes of the Bahamas yield a scientific trove that may even shed light on life beyond Earth.

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