Titan sub: What happens next after sounds detected in search

News that noises have been picked up in the hunt for a missing submersible has offered a glimmer of hope that the five men on board are alive.

The sounds were recorded by sonar buoys in a massive rescue operation, which is racing against time to find the Titan in the middle of the Atlantic Ocean. It was lost on a deep-sea voyage to the Titanic wreck three days ago.

Underwater operations have been relocated to investigate the noises, the US Coast Guard has said, but so far they haven't found anything.

And with oxygen supplies expected to run out at around 11:00 GMT on Thursday, the next few hours are critical.

US authorities say the noises were heard at half hour intervals for about four hours on Tuesday, according to reports by several outlets. read more