What is that giant Hovering Boat called?

[Tristan]

I really need to know and I can't think of it... I know it's really big, and it's got a tunnel like thing under it to compress it or something off the water

 

[Tom]

They are commonly called hovercraft.

 

[RichardC]

There are several ships in trials or limited duty. The Surface Effects ships use an airfoil type hull between two hulls. Catamaran style. There are three HSV ships that are relatively small 300+ ft. These are also catamaran style the can run for 4 hours at near 55 MPH and cruise at 35MPH for 5000 + miles. the surface effects ships are larger , but slower.

 

[Min]

Hovercraft.