Titanic tourist submersible: desperate search for sub missing with five onboard

French expert and British explorer believed to be among five onboard submersible missing in north Atlantic since Sunday

• Explainer: what is the Titan tourist sub and what might have happened to it?

Search and rescue teams were racing against time on Monday to find a tourist sub that went missing in the north Atlantic while on a dive to the wreck of the Titanic.

The US Coast Guard said a small submarine with five persons onboard" had gone missing in the vicinity of the Titanic wreck and that the vessel had the capacity to be submerged for 96 hours, but it was unclear whether it was still underwater or had surfaced and was unable to communicate.