The clock is ticking for rescuers to save the five people trapped in a submarine in the Atlantic Ocean, but there are still some reasons to be hopeful.
Sonor equipment detected what rescuers believe may have been tapping noises from the search area for the missing deep-sea vessel called Titan - which has spurred the search on.
Five tourists, including Britons, paid around £200,000 to OceanGate Expeditions for what should have been an eight-hour trip in Titan to view the Titanic shipwreck.
