PBS
Pbs Nova: Extreme Cave Diving
Follow a team of scientists as they explore underwater caves, in the Bahamas, that formed during the last Ice Age. They are one of the least explored and most dangerous places on earth. [01:23:00] (9 February 2010)
Science Friday Initiative
Science Friday: Cave Science
Ready to go spelunking? Live from Missouri, the cave state, get an inside look at the biology, geology, and history of the underground attractions that gave the state its name.
PBS
Pbs Teachers:caves
Explore the California Cavern. Watch two kids use the scientific method to determine how formations change as they travel into deeper parts of a cave.