The bus that's making a splash on the Clyde

An amphibious bus is being tested on the river Clyde which could replace the Yorker to Renfrew ferry which will end service in March. Will it really work? The video is worth a watch anyway. There is a tour bus called the 'DUK' in London which uses a ex military vehicle which is part boat and part truck. The difference with this bus is it actually looks very much like a coach, so much that I am left wondering how it floats!