Titanic submersible: Possible signs of life detected via sonar
Five passengers were on the missing submersible that can keep them alive underwater for a maximum of 96 hours.
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: 
