Greg Brooks: 'Unimaginable wealth under the sea'

A Maine treasure hunter says he has discovered a WWII-era shipwreck filled with platinum, now worth $3bn (£1.9bn).

Greg Brooks of Sub Sea Research says a wreck sitting 50 miles (80km) off the US Atlantic coast is the SS Port Nicholson, sunk in 1942.

The Port Nicholson, a British merchant ship, was torpedoed by a German U-boat in an attack that killed six people.

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