A battery of heavy machinery and submarines dubbed the 'last chance' for the crew of the Titan tourist submarine arrived in Canada tonight - but it now faces a race against time to help rescuers in the desperate search. The array of winches, cables and unmanned vehicles capable of going 19,000 feet underwater were delivered to St John's airport in Newfoundland by three US Air Force cargo planes. It was taken with a police escort to the port where a waiting ship, the Horizon Arctic, was due to set sail at midnight.