For those looking for the ultimate escape, Netherlands-based Waterproof Expeditions and U-Boat Worx—the latter manufactured the newly released HP Sports Sub 2—have teamed up to offer a series of submarine pilot courses off the Mediterranean island of Malta for the month of August. The excursions take place aboard an air-conditioned, electrically propelled U-Boat Worx C-Explorer 3, capable of an underwater speed of 3 knots and a diving depth of 3,280 feet. The two-day introductory course gives participants an e…