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'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

Safety investigations launched into Titan sub deaths

Canadian city ready to help in search for missing sub

Watch: The missing Titanic sub... in 77 seconds. Video, 00:01:17Watch: The missing Titanic sub... in 77 seconds

Titan sub: Narrow, dimly lit tube with curtained-off toilet

Rescuers scan ocean for Titanic sub as clock ticks

How the search for the Titanic sub is unfolding. Video, 00:00:57How the search for the Titanic sub is unfolding

Titanic wreck dives 'frightening at best of times'

Who is involved in search efforts. Video, 00:01:50Who is involved in search efforts

Search expert describes friends missing on Titan sub. Video, 00:01:57Search expert describes friends missing on Titan sub

Titanic sub visitor: We're aware of risks, it's not a lark. Video, 00:01:36Titanic sub visitor: We're aware of risks, it's not a lark

What it's like on board the Titanic tourist sub

Watch: Inside Titanic sub before it went missing. Video, 00:00:24Watch: Inside Titanic sub before it went missing

Missing Titanic sub may have 70 hours of oxygen left

Missing Titanic tourist sub is 'rock solid' Video, 00:00:52Missing Titanic tourist sub is 'rock solid'

Video shows 3D view of the Titanic shipwreck. Video, 00:00:11Video shows 3D view of the Titanic shipwreck

Underwater sounds heard in search for sub

Titanic exhibition to show off local links at museum

'Breathtaking' necklace uncovered in Titanic wreck

How Welsh town's amateur radio heard Titanic SOS