Washington: In the course of looking for a submersible that disappeared while transporting five people to the Titanic wreck, the US Coast Guard reports that a Canadian aircraft has picked up underwater noises.

The location of the search has changed as a result of the noises picked up by the Canadian P-3 aircraft. These investigations have turned up nothing, but they are still ongoing.

A push was made to get salvage equipment to the scene in case the sub is found, and in addition to an international fleet of ships and aircraft, an underwater robot had begun searching in the area of the Titanic.

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According to a US Air Mobility Command spokesperson, three C-17 transport aircraft from the US military were used to transport a commercial submersible and related equipment from Buffalo, New York, to St. John's, Newfoundland, to help with the search.

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The Canadian military claimed to have sent two surface ships, one of which specialised in dive medicine, and a patrol aircraft.

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Authorities launched a search in waters about 700 kilometres south of St. John's after receiving a report that the carbon-fiber vessel was overdue on Sunday night. Pilot Stockton Rush, the CEO of the company organising the expedition, was in charge. A British explorer, two members of a Pakistani business family, and a Titanic expert were among his passengers.