The Krakaboard is a military electric surfboard also called stealth jetboard. The inflatable Kraka jetboard shall help soldiers to transport 2 or 4 people with equipment without noise on the water.
The jetboard from Sweden has a 11kW motor and can reach up to 28 km/h. The lithium ion battery pack shall last for 30 to 60 minutes.
Once deflated it can be easily transported by helicopter, boat, car or even submarine. It also can be towed to transport materials up to 1,000 kg.
More infos at: https://www.krakaboard.com