The Amfibidiver amphibious submarine. Never saw production unfortunately.
So he conceived a boat that that could drive itself off the trailer, along the road and into the water whilst carrying larger quantities of air and equipment than any diver could carry. His dream boat could travel to the dive area like a speedboat and then literally … pull the plug out and dive. Whilst dived, it had to be able to cruise around underwater until he found the right area, then park on the bottom as an underwater base to support diving activities for two. When finished, the idea was to blow the ballast, surface, and return to land at high speed, driving out of the water and onto its trailer.