In the world of marine engineering, supercavitation accelerated method most hegemony. Supercavitation an effect is created when a layer of gas bubbles form around an object inside a liquid (imagine submerged part of the ship was surrounded bubble). Reduces air friction layer 900 times higher than normal, which means moving faster than the movement in the water.
Therefore any public vessel equipped with this technology are enormous assets for all naval fleet. In addition to faster and less fuel, speed and its shape makes it easy to locate via sound waves. It even smelled smoke torpedo for the race. Juliet Marine Systems, a private company in Portsmouth, New Hampshire, is trying to work out a way. It's called ghosts, created for the purpose of defense - protection for naval vessels, and expel the pirates poised eyeing commercial vessels. It can also be a fully effective ferry landing in enemy coast.

There is a waterplane. It looks like a normal plane but it has 4 wheels, so it can run on the surface of the river or the ocean. It also has 2 wings, so it can move faster in the sky. This car is very friendly with the environment. It can collect a lot of rubbish, waste,... in th river then treat them automatically. It maybe a great invention to help to protect the environment. 

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