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The world is now praying for a 'miracle' with the vital oxygen supply predicted to have run out at 12.08pm GMT (7.08am EST and 9.08pm Sydney). Banging has been heard at 30 minutes intervals.
The window of survival for the five passengers onboard the Titan sub is rapidly closing, with the oxygen supply due to run out at 7.08am ET (12.08pm UK time) today, the US Coastguard said.
The vessel, named Titan, lost communication with tour operators on Sunday while about 435 miles south of St John's, Newfoundland, during a voyage to the Titanic off the coast of Canada.
Sydneysider Emily Jateff had just graduated in 2005 when she was chosen to take part in an expedition to the doomed ship's remains at the bottom of the Atlantic Ocean.
Rescue mission led by US, Canadian and French maritime authorities could not trace whereabouts of missing submersible