Former Royal Navy commander Ryan Ramsey, 53, has warned there is 'no way' of rescuing the missing crew aboard the OceanGate submersible if the tiny craft is still thousands of feet under the sea because the technology required 'doesn't exist'.
However, the vessel could be floating on the water's surface, meaning it will be easier for rescue crews to locate the submarine before the air runs out.
Ramsey, who served in the Navy's submarine service for 23 years, told MailOnline that those on board - including French explorer Paul-Henri Nargeolet and OceanGate chief executive Stockton Rush - will now be facing dwindling oxygen levels, while another expert warned the crew members likely face the risk of hypothermia.