Balmorhea State Park, Texas...The 30ft deep, concreted, spring fed pool is so awesome . You have the opportunity to swim with several different endangered species of fish, catfish, and turtles. You can also snorkel, scuba dive, and jump off from two diving boards.
Freediving is a form of underwater diving that relies on a diver's ability to hold his or her breath until resurfacing rather than on the use of a breathing apparatus such as scuba gear. Without tanks, free diving creates no bubbles, and is quiet, so the chance of encountering marine life is increased.