Ekranoplans, special ultra-low flying aircraft, promise to combine features from ships, airplanes, and hovercraft. There are many designs and projects out there, but they have yet to truly realise their promise. Now the discovery of the large 4-jet 'Bohai Sea Monster' in China harks back to the mysterious Soviet projects of the Cold War.
I’d be cool if the link Buenos Aires-Montevideo could be done by ekranoplane