Mr Losay said the speed the vessel sunk could only be explained by the involvement of a submarine.

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It was a type of merchant vessel known as luxury liners or speed queens as they were once called.

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But if you are purchasing a superyacht you would want a vessel that was transglobal and you'd want a reasonable speed.

CNN: September 15, 2011 -- Updated 1540 GMT (2340 HKT)

Manannan will be the largest vessel of her type in the Irish Sea with a faster cruising speed than other ferries.

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Boarding a vessel on the Nile is to peel back millennia and slow down to river speed as ancient temples, oxcarts and palm trees pass by, unaltered since Pharaohs ruled the roost.

BBC: Journey down the world��s longest rivers