The power supply group is located on the left of the corridor at the bottom of the steps which descend from the fortified entrance.

In it you find:

• a cement base in front of the opening of the alcove which supported the electric power supply group (type Condor U.1620, rated at 1.62 kW, 72-90 V DC, gasoline motor);
• a pit in the pavement behind the base for the gasoline container (430 liters);
• a niche in the right wall beside the base with a pair of metal brackets which probably held the batteries.