From: Defense Express

Kronos chief designer is confident that the submarine can be used to attack russian Black Sea Fleet
A functional prototype of Kronos submarine made its debut at IDEX-2023 defense exhibition in Abu Dhabi in March 2023. It is unclear when the submarine might be ready for use, but according to Newsweek, Highland Systems that is developer of this project, reported that six drones are enough to control the Black Sea.
The Kronos armored submarine, which is being developed by Ukrainian designers at the UAE-based Highland Systems company, has a shape that resembles a stealth aircraft. Engineers claim that Kronos can perform a full 180-degree turn at maximum speed, which is beyond the capabilities of any other underwater drone. The chief designer and founder of the company, Alexander Kuznetsov, is confident that the modernized submarine can be used to attack russian Black Sea Fleet.