Super Boats: 5 New Designs Go Fast, Far—Even Fly! (With Videos)

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Imagine a Jet Ski that can roll 360 degrees, plunge underwater and then leap nearly clear of the surface. That’s the idea behind the Innespace Seabreacher, a two-seat, 175-hp watertight speedster that’s capable of 35 knots on the surface and 17 knots below. “Certainly it’s the fastest submersible craft out there,” says Innespace co-founder Rob Innes.

Like the product of some ungodly union between a dolphin and an F-16 fighter, the Seabreacher uses steerable winglike fins to maneuver on three axes. Power comes from an Atkins rotary engine that draws air through a snorkel, so the Seabreacher can’t descend more than a few feet beneath the surface, and it can’t stay below for more than 30 seconds.

Though the vehicles cost a relatively modest $70,000, don’t expect to find hordes of riders tearing it up on crowded public waterways anytime soon. “It’s like owning a monster truck,” Innes says. “The Seabreacher will go through its paces at sanctioned racing events and sealed-off public waters.”