Explorer's harrowing experience of being trapped at Titanic stern in 2000

Titanic tourist submersible: Huge effort to find vessel as air supply dwindles

Titanic tourist submersible: Rescuers scan ocean as clock ticks

Titanic tourist submersible: My trip aboard the sub

Hamish Harding: British adventurer among crew missing on Titanic sub

Titanic tourist sub goes missing sparking search