ALVIN This is ALVIN — the very first, durable, three-person submersible vehicle. ALVIN turns 50 this year! “He” found a lost hydrogen bomb in the 1940s, explored the first known hydrothermal vent and scouted the wreck of the Titanic in 1986. ALVIN has completed more than 4,600 dives and is still going strong. Happy submerge-a-versary, ALVIN! Learn more about ALVIN and “his” accomplishments here .