I know it's been seen before, but Hydroptere really is an amazing piece of engineering.
Some good pictures are on this article:
www.dailymail.co.uk/news/article-2317001/Hydroptere-Super-yacht-clock-60-miles-hour.html
Interesting parts of the pic... looks like the foil breaks the surface, but no ventilation
- the bulb isn't cavitating.