Missing Titan sub: Explorer's daughter hopeful he will be rescued
Sidonie Nargeolet said her 77-year-old father had been near the Titanic wreck 30 times, the first in 1987.
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: 
