Four groups inlcude:
Main Ballast Tanks
Variable Ballast Tanks
Special Ballast Tanks
Fuel Oil Ballast Tanks
Main -
MBT 1 - 49,17 tons of sea water
MBT 2a,b,c,d - 129.03 tons of sea water
MBT 6a,b,c,s - 141.60 tonds of sea water
MBT 7 - 39.09 tons of sea water
Variable
Foward Trim - 24.31 tons of sea water
FWR WRT - 4.94 tons of sea water
Auxiliary Ballast 1 - 30.77 tons of sea water
Auxiliary Ballast 2 - 30.77 tons of sea water
After Trim - 19.97 tons of sea water
After WRT - 5.06 tons of sea water
Secondary purpose of the WRT tanks is to receive water drained from the torpedo tubs
Special
Safety - 23.23 tons of sea water
Negative - 7.51 tons of sea water
Bow Buoyancy - 31.69 tons of sea water
Fuel
Fuel Ballast 3a and b - 19,196 gallons
Fuel Ballast 4a and b - 24,089 gallons
Fuel Ballast 5a and b - 19,458 gallons
Fleet Type Submarine Manual, Chapter 4 - Tanks