Seabreacher X
www.seabreacher.com/seabreacher-x
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
The Seabreacher X is the latest and most advanced submersible watercraft that we have built to date: This exciting new version is based on the dolphin-inspired Seabreacher J, but it has a more aggressive Shark-style body. The X model also steps up the performance envelope with a 260hp supercharged engine, propelling the vessel to a top speed of 50mph on the surface and 25mph below.