Going into the futuristic gear, Toyota HSCV-40 concept is for a time when humans will inhabit underwater cities. Designer Olof Claesson’s water jet driven concept runs on an 800hp engine powered by biofuel, with the ability to go at a mind-numbing 300 knots.

From TDB:

“The vehicle offers unparalleled maneuverability during both high and low speeds, thanks to the steering being given through both flaps and the jets. The refueling will be done at unmanned stations with the biogas produced in the self-sufficient underwater city environment. The high-tech navigation system helps the vehicle to operate with or without a driver.”

Source:  Automotto.org