Missing Titan: The Titanic sub has a history of malfunction - adventurer
60-year-old Arthur Liobl described his trip aboard the Titan as a "suicide mission."
The Titan submersible, operated by OceanGate Expeditions to explore the wreckage of the sunken SS Titanic off the coast of Newfoundland, dives in an undated photograph(photo credit: OceanGate Expeditions/Handout via REUTERS)Updated: 
