Coast Guard finds debris field in hunt for Titanic sub

Missing Titanic sub search in critical phase amid fears over oxygen levels

Missing Titanic sub search team expand search area as oxygen fears mount

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

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

St John's ready to help in search for missing Titanic sub

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