WIG (Wing in Ground) Ships

As I was reading over MOMAF's "Blue Revolution" document, which outlines how the Korean government plans to develop Korea's maritime industries, I came upon this entry entitled "Promoting the Utilization of Large-sized WIG Ships." I'd never heard of WIG ships so I googled it and here is the first picture that came up.

Apparently these airplane/ship hybrids have been long been in development both for their potential military applications (see this PPT presentation) and as a middle-ground shipping option because they are cheaper than airplanes and faster than ships.

WIG (Wing in Ground) Ships