1.) Host Peter Berle reports on the use of the U.S. Navy Sound Surveillance System to listen to the sounds of the ocean floor. Berle talks with Steve Hammond from the National Oceanic and Atmospheric Administration about what they've learned from the technology. 2.) In the segmen Portrait of a Place, Tom Horton, author of Island out of Time, discusses Smith Island in Chesapeake Bay. 3.) In the segment Earth Calendar, Thomas Lalley talks with biologist Brant Gilmore about the mating habits of the sand tiger shark.