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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

Remote area makes sub search 'a challenge' Video, 00:01:03Remote area makes sub search 'a challenge'

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

Cheers as Titanic cup sells for thousands

Scans of Titanic reveal wreck as never seen before

Titanic exhibition of artefacts and film props to open

Plan of Titanic from sinking inquiry sells for £195k

Titanic rail trip recreated for anniversary event

Titanic hero's medals to be auctioned

How losing a finger on Titanic saved a man's life

Titanic ship plan could sell for £200k at auction

Titanic project unites two west Belfast schools

Titanic cup found in kitchen could sell for £2,000

Titanic cup and saucer sell for £6,000