UBOAT is a simulator of a submarine from WWII era, yet different than all you have seen so far. It is a survival sandbox with crew management mechanics while its primary theme is life of German sailors. The boat is their home, but it can become their grave at any time. In UBOAT you control the crew in order to control the boat. You look after their physical and mental health, because if the sailors are hungry, tired and their spirit is low, there's no chance of winning even a skirmish.
The extensive damage system is a foundation of the game's survival elements. Unprecedented situations are bound to happen as the effect of received damage, testing player's creativity and ability to stay calm. You can try to save the whole crew or leave someone behind, to save the others. While your ship travels through the open seas, you will often find yourself being on your own. Use your management skills to spend resources taken on the trip optimally and in special cases try to recover them on the sea, by asking your allies for the help... or by looting wreckages of enemy ships.
During the playthrough you will receive assignments from the Kriegsmarine headquarters. They are never linear and you may receive additional orders during them or face unexpected problems. Brave completion of assignments from the headquarters is rewarded with additional budget for the unit under your command and with acceptance of your growing reputation as an u-boat's skipper. You will need that, to upgrade your ship and keep up with enemy's technological advances.