Time is running out for the five adventurers inside the missing Titanic tourism sub - as it emerged there may only be two deep sea vessels on the planet with a fighting chance of rescuing them before their oxygen runs out on Thursday.US and Canadian ships and planes have swarmed the area about 900 miles east of Cape Cod but are yet to find them as the search enters a third day today.Officials are racing to get a remotely operated vehicle (ROV) to search for Titan - the name of the Titanic submersible. These can reach a depth of 20,000ft and are connected to a ship via an 'umbilical cord', allowing the pilot to control it from above using thrusters and relay images from sonar and camera systems. Some can lift objects from the sea bed.
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