Factbox-What is the OceanGate submersible and how does it work?

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

Banging sounds were detected during the search for the missing Titanic submersible, a US memo says as oxygen supplies dwindle and the search intensifies

Searchers detect undersea sounds in hunt for missing Titanic sub

Titan sub has heated walls, private toilet and games console controller

Titanic tourist sub missing for third day with five aboard

Who's on board the missing Titanic sub?

What we know about the missing Titanic-exploring submersible

Titanic tourist submersible: My trip aboard the sub

Hamish Harding: British adventurer among crew missing on Titanic sub

Submarine exploring Titanic wreck missing, search underway