This game from 1996 is a "cult game" and "must-have".
Today still run with DOSBox.
The gloom in the underwater world and the graphics are very well done. Unfortunately, never got a worthy successor. :-(
After mankind has almost wiped itself and a life on land due to nuclear contamination is no longer possible, mankind has taken refuge in the depths of the oceans. While there is a storyline, but this does not prevent free to drive from station to station, eg in order to trade to make some money on the side to better equip his submarine. The special thing about this game is certainly the mood as well as the submarine missions not just follow one after the other, as in today's action games common. Especially the exploration and discussions at the respective stations / towns make something special.
A remake of Win 7 with today's graphics capabilities would be desirable.