Blue Spring (Volusia County) is located in a large state park in central Florida and offers excellent camping facilities. Blue is known for its manatee migration in the run during the winter months. There is a large slit cave (right) that drops down to 120 feet where a restriction limits further exploring. On the way down, there are smaller caves that dead end into darkness about 15 feet back. At 60 feet open water divers will encounter a sign warning them to not proceed any further. Cave divers may continue only to be confronted w/ a strong flow that’s known to blow the mask right off a diver. You must check in and register to scuba dive. Scuba diving is $5-$10 to dive. Check with the park before you go, as they periodically shut down due to algae growth or manatee migration.

http://www.planetdeland.com/bluesprings/