Mysterious and dangerous to explore, blue holes are underwater caves,
formed as long as 300,000 years ago during the Ice Age. They are liquid
time capsules, filled with fossils that offer clues to the history of
our planet. Introduce blue holes to your students.
Extreme Cave Diving
(Video)
Go beneath the surface of the Bahamas in the Caribbean Sea, and explore
some of the water-filled caves known as blue holes that stretch for
hundreds of miles. (Chapter 2, approx. 12 min.; Program available after
broadcast)
