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The fire spread quickly, engulfing the engine room and forcing the divers, instructors and crew to jump into the sea, he added.

A Russian cargo ship, Ursa Major, has sunk in the Mediterranean between Spain and Algeria after an explosion in the engine room, Russia's foreign ministry has confirmed.

Kubinec, as a fireman, was probably working in the engine room aboard the West Virginia, Svoboda said.

Tim Parker Eaton is understood to have been in charge of adequately securing the yacht's engine room and operational systems, while Matthew Griffith was on watch duty during the night of the disaster.

There are also other entry points for water around the boat known as "down-flooding points", which are there to allow the engine room to be ventilated, among other things.