Deep Sea Detectives

A visit to the Nan Madol site of Pohnpei in Micronesia to explore the underwater surfaces of structures built by prehistoric Micronesians. Included: a look at mysteries regarding supposed secret tunnels and hidden treasures. Hosts: John Chatterton and Richie Kohler.

Exploring underwater caves in the islands of the Greater Antilles once inhabited by the Taíno people.

The legendary Loch Ness monster is the subject. Included: a dive into the Scottish lake.

Off the coast of New Hampshire on June 20, 1941, the U.S. submarine 0-9 gently slipped beneath the waves - and vanished without a trace. The 0-9, and her entire crew of 33, were never seen or heard from again. Years of exhaustive investigations offered few answers ... until now.

Wreckage of the USS Meredith, sunk off the coast of Normandy in 1944, is explored.

Examining mysteries surrounding the sinkings of three boats off the Eastern seaboard in 1999: the Beth Dee Bob, Cape Fear and Adriatic.

Exploring the wreckage of more than 50 German ships sunk on June 21, 1919, in England's Scapa Flow.

Exploring the wreckage of the USS Susan B. Anthony, which was sunk on June 7, 1944, off the coast of Normandy when it struck a German mine.

Wreckage of a U-boat sunk in the Moray Firth, Scotland, in 1945, is explored. The vessel has been unidentified for years, and the divers hope to solve the mystery.

The wreckage of the Rhein, a German freighter scuttled in 1941 by her own crew off the coast of Florida, is explored.

Germany's Type 21 U-boats threaten to change the course of World War II and the Cold War.

Exploring the wreckage of the USS Perry, which sank in 1944 in the Palau Archipelago after hitting an underwater mine. The Perry was attempting to clear mines for an Allied invasion of the Japanese-held Palau Islands.

Probing why the Tecumseh, a single-turret Civil War monitor, sank during a Union attack on Mobile Bay in 1864.