Unsinkable Mobo

[fireball]

Stan Widmer, a former powerboat racer, developed the double walled boat which is constructed using a thermoplastic polyethylene crosslinked material.

The boat's trials on Lake Winnebago in Wisconsin are being monitored by the US Navy, which has put some $2.5 million into the project.

"This plastic boat is unsinkable," said Mr Widmer, "so it would save lives".

Ok - quite happy with the concept of 'unsinkable' ... but $2.5million for a plastic bathtoy with an engine?
How many boats do they have sink that result in deaths anyway? Wouldn't it be cheaper just to buy some liferafts??!!