Tis is the lowest floor #4 of the bunker (or #5 if you count the turret room). Huge tanks for fuel and water are installed here. Stocks should be enough for 60 days of fighting in enemy surroundings and in conditions of radioactive and chemical contamination.
The bottom of the reinforced concrete block with living quarters is seen upward. This block does not imbedded into the rocky ground, but stands on special pads and separated from the rock with air space.