It’s called Seabreacher, a two-person semi-submersible water craft with a top speed of 100 km/hour on the surface and 40 km/hour underwater. It can dive up to 1.5 metres beneath the surface for as long as 30 seconds. With a sharp pull-up, it can “breach” out of the water as high as 6 metres. Side sticks provide full three-axis control, and rolls can be performed.
It’s powered by a 300 horsepower (224 kW) Rotax engine. With the canopy closed, the cockpit is watertight and doesn’t flood when submerged. It is powerful enough to tow water skiers.
There are a variety of models and customisations available. Price is estimated between US$ 80,000 and 100,000, so it ain’t cheap.
Here is the manufacturer’s Web site.