two large electric motors in the motor room (below the main deck) propelled the submarine both
on the surface and when submerged.
Each motor drove a separate screw (propeller) through a rotary
The motors derived their electrical power from the diesel
engine-driven electrical generators while the boat was on the surface.
While submerged, power came from the electric batteries in the
forward and after battery compartments.
Huge electrical switches, needed to
accomplish the change-over from generator to battery power and
to establish the charging of batteries by the generators, were
located in the “control cubicle”. Two controllermen actuated the switches from the “maneuvering
panel” that was aft of the cubicle, at the after end of the compartment.
The controllermen adjusted individual motor speeds as ordered.