The Underwater Roller Coaster of Yokohama, Japan. Indeed, the attraction is actually called Vanish for that very reason. As its name implies, the ride dives headlong into a tunnel constructed underwater. It is 2,440 feet in length, and a single ride will take around one minute and 58 seconds to complete. This ride should be on your list of must-try attractions if ever you find yourself in Japan. However, if you have a paralyzing fear of being trapped underwater, this ride may not be the one for you.