An interior glimpse aboard USS Drum (SS-228), starting in her stern at the After Torpedo Room. These are tubes number 7, 8, 9, and 10, with a torpedo partially loaded into tube 9. The next compartment forward is the Maneuvering Room, where Drum’s propulsion plant is controlled. Shown is the main propulsion control cubicle; an Engine Order Telegraph is mounted on either side of the cubicle, as is a Revolutions Indicator, but only the starboard one is in the frame. The Engine Governor is the central set of protruding dials and knobs. The levers are for manually operating the connections and directions of the propulsion motors to the screws. This is where the boat could be switched from diesel to electric propulsion, put into reverse, and have her speed dictated.
Next is the port diesel engine, or Engine no. 4, in the After Engine Room, with the Forward Engine Room and Engine no. 2 visible through the door at the end of the compartment. Drum had four diesels, each driving a main generator that powers the propulsion motors on the surface. Each engine had 16 cylinders, capable of over 1,600 bhp.
Propulsion was not the only part of moving a submarine though; she could move 3-dimensionally, including up and down, which required the use of diving planes at both the bow and stern. Control Room handwheels for each set is shown in the next photo. An emergency lever is on the far right. Depth indicators are the large gauges above each handwheel. Angle indicators are also present above each wheel. If one were to pivot about 120 degrees from the angle of that photo, you’d be looking at the next set of equipment, which is the steering wheel for the rudder, the Christmas Tree panel indicating watertight integrity, a plotting table, and the ship’s gyrocompass at the center.
Moving forward, we see officer’s sleeping quarters, the Wardroom where officers ate, and the Forward Torpedo Room with tubes 1-6. The last two photos are a teaser of sorts - taken amidships, one looks up into the Conning Tower from the center of the Control Room, while the other shows the Conning Tower steering wheel, which was a near mirror-image of the main steering station.