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Billionaire Yachts Are Passe as Monaco Peddles Luxury Submarines

Graham Hawkes, inventor of the “underwater plane,” made his debut at the Monaco Yacht Show this week in a bid to entice billionaire boat owners to take the plunge.

“This is literally like flying underwater,” Hawkes, a U.K.-born ocean engineer who has spent decades designing cutting-edge diving suits and submarines, said in an interview. “Once you’ve done that, you don’t want to do anything else.”