Veryovkina Cave reveals more mysteries the deeper you go. Here’s everything that makes this cave a world of its own ...

Wading into the dark unknown of Western Kentucky's cave wasn’t uncommon for Floyd ... “It is terrible inside,” Miller wrote for the Feb. 4, 1925 edition of The Courier Journal.

Take a deep breath and dive below the surface with cave-diving experts and scientists in the video above. Find out what it takes to plunge into the dark and mysterious world of underwater caves. Caves ...