"The performance figures are nuts. Highland says it'll do 80 km/h (50 mph) on top of the water, or 50 km/h (31 mph) underwater; that's seriously fast through water, just ask Michael Phelps. It carries enough battery on board for a 36-hour all-electric mission, or you can fire up the diesel generator to add a further 18"
https://newatlas.com/marine/kronos-armored-submarine/"The 30-foot vessel will have a carrying capacity up to 3000kg. The full load displacement of the vessel will be 10000kg, while the craft can accommodate one crew member and 10 commandos. Top speed underwater is of 27 knots, with a cruising speed of 16 knots.
In addition to this, the submarine can be equipped with six mini-torpedoes capable of striking enemy ships and port bases."
Highland Systems develops futuristic submarine
https://defence-blog.com/highland-systems-develops-futuristic-submarine/
