National Geographic Video: Secrets of the Titanic 1986

Dr. Robert Ballard of Woods Hole Oceanographic Institute and his research team become the first undersea explorers to locate, photograph, and explore the wreckage of the ill-fated HMS Titanic, which sank on its maiden voyage 2 1/2 mile deep in the icy waters of the Atlantic in 1912, taking 1500 passengers and crew with it to a watery grave. Utilizing dazzling state-of-the art equipment and cutting edge expertise they record the decaying remains of the ocean liner once thought "unsinkable."

Cast:

Robert D. Ballard
Self 

Martin Sheen
Self - Narrator 

Dudley Foster
Self