A unique feature was that Aces of the Deep came with a realistic Kriegsmarine War Grid map in which the player used in reference to finding their patrol zones.

The game includes single mission mode, where the player can choose to attack a convoy, a taskforce of warships (consisting of cruisers and/or battleships), or a carrier task-force in a variety of conditions.

An expansion package for either the floppy or CD versions of Aces of the Deep adds brand new missions, areas and a special prototype XXI U-boat submarine.

Some of the more interesting features are the six new historical missions as well as the ability to enter (but possibly not leave due to currents) the Mediterranean Sea.

It also added the option, with a compatible sound card & microphone, to use voice control for certain submarine actions, like dive and fire, which is why the game received the expanded title.