Offshore flooded caves, so-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. Inland blue ...

Beneath the land surface of the Bahamas, the underwater caves known as blue holes stretch for hundreds of miles in all directions. Today, these labyrinthine passages host a variety of tiny sea ...

The show, called “Ao no Dokutsu (blue cave) Shibuya,” features about 600,000 blue LEDs along an 800-meter stretch between Shibuya Koen-dori street and rows of zelkova trees in Yoyogi Park in ...

The sparkling blue waters of the Mediterranean ... Importance: These caves contain evidence of how Mediterranean Sea levels have changed over time. Dive category: This is an advanced cave dive ...