A top secret special ops submarine from World War II has been discovered after a 20 year search. Hear about it at Urban Legends and Stranger truths. A veteran Greek diver has announced that he's discovered the wreck of the HMS Triumph after searching for more than 20 years. The wreck of a British World War submarine that helped to usher in the era of special military operations has been found off the coast of Greece, where it sank back in 1942