Biscayne National Park, just south of Miami, is all about what lies beneath. Ninety-five percent of the park is covered in water and is best explored by snorkeling or diving. EcoSense follows a group of divers, some veterans, some disabled, on the park's Maritime Heritage Trail of 6 shipwrecks, complete with submerged historical trail markers. The trail is an opportunity for archeologists to study the human history of Florida's reef, and for visitors to experience a trail like no other in the National Park System. Pulitzer prize-winning biologist E.O. Wilson expands our horizons with his wisdom on how places like national parks can preserve the planet.