Melanie Wallace

NOVA: Lethal Seas

Researchers seek solutions to contain the rising acidity levels that are threatening the world's oceans.

Hitler's Lost Sub

In 1991, professional diver John Chatterton discovered a sunken German U-boat from World War II, lying undetected only 60 miles off the New Jersey shore, its unexploded torpedoes and the bodies of its crew still aboard. This two-hour special follows Chatterton and his dive partners in their dangerous quest to identify the missing U-boat, a pursuit that takes six years and costs three lives. The U-boat's history involves unusual coincidences and a startling twist of fate.

Kingdom of the Seahorse

To many of us they are a figure of fancy on par with the unicorn. To scientists, however, the seahorse is a fascinating object of study. Unlike other animals, in seahorses it is the male who get pregnant and gives birth. But to populations around the world, the seahorse is something else again; considered a source of sexual prowess to proponents of traditional Chinese medicine, the magical seahorse is also a crucial source of income to fishermen in the Philippines who harvest and sell them to that burgeoning trade.