Here's a jetski like watercraft which is complete covered and shaped like a dolphin. It can only submerge up to two feet but it can do rolls and dives within that two feet. Additionally they claim it can jump up to 10 feet out of the water and is powered by a car size 300 hp engine. The cockpit glass of the watercraft is from an F-18 and is about half an inch think which lets it withstand it hitting the water. In the photo on the main site for the watercraft it looks to have two seats in it but in the video it seems like it only has one seat.