Submarine Tank Arrangement

I recently found an old submarine school training manual and it brought to mind the fact that I almost failed the "tank" test in submarine school. Such a failure would have been catastrophic in that it would have immediately ended my future as a submariner. The tank arrangement was required to be memorized. Here is a photo of the arrangement of the tank system on the Sterlet It is typical for the fleet, diesel, submarines built during World War II. Every qualified submariner knew these by heart.

I can still hear the sound echoing in my ears, "Blow Bow Bouyancy, Blow the Forward Group, Blow the After Group......."