Titanic submersible accident

Parts of missing sub's cover found, expert says

Sub firm co-founder fears 'instantaneous implosion'

The search for the Titanic sub in maps and graphics

Daughter of French explorer speaks. Video, 00:00:41Daughter of French explorer speaks

The search field explained. Video, 00:01:23The search field explained

Hunt for missing Titanic sub in critical phase

Why the oxygen timeline on sub may not be so fixed

Titanic sub: The latest in 70 seconds. Video, 00:01:10Titanic sub: The latest in 70 seconds

Sub rescuers expand search area as oxygen fears mount

Watch: Titanic sub passenger recalls losing contact. Video, 00:00:40Watch: Titanic sub passenger recalls losing contact

BBC News. Titanic Sub Search. Video, 20 minutesBBC News

Inside Canada's search and rescue plane. Video, 00:00:39Inside Canada's search and rescue plane

What happens if the oxygen runs out. Video, 00:01:10What happens if the oxygen runs out

Sounds a glimmer of hope in sub search - but what next?

The location of search and rescue efforts. Video, 00:01:45The location of search and rescue efforts

Titanic sub: 'We have to remain optimistic and hopeful' Video, 00:00:58Titanic sub: 'We have to remain optimistic and hopeful'

Experts had warned about safety of missing sub

Adventurer who visited Titanic hopes for rescue

'No confirmation of what tapping sounds are' - Coast Guard. Video, 00:00:47'No confirmation of what tapping sounds are' - Coast Guard

How tapping sounds might reach rescue teams. Video, 00:01:33How tapping sounds might reach rescue teams

Scientist recalls near-fatal dive to Titanic wreck

Search for sub relocated after noises heard