Incredible photos, Neil, and a testement to both the design and capabilities of these types of craft especially when they are under the controll of a suitably skilled & experienced helmsman. Despite all the computer predictions, you've got to admire the crews who conduct the very first live surt-tests of all the 'extreme conditions' types of vessel.
Whilst not wanting to alter the course of the topic from the Interceptor, if anyone is interested in images of 'boat vs. large wave' scenarios, these Interceptor pictures are similar to some of a USCG 47ft MLB off Morro Bay, Calif - a model I'm keen to build and still have a 'Help please' advert for in the Wanted section.