Corrected entry: It is a known scientific fact that a planet without land will create waves rising from 500 to a thousand feet. This is because there is no land that can break the waves' rise. This would make the surface uninhabitable by any man-made structure or vessel especially with Waterworld's current human technology. Waterworld barely has any waves.
Soylent Purple
9th Jan 2006
Correction: It is not a known scientific fact. It is one scientific theory that is impossible to prove. Computer models can only begin to guess at the effects of no land above water. And in Waterworld there is at least one landmass which they find, and there are probably more as the melting ice-caps are not sufficient to cover the entire surface.
Soylent Purple