Except the two watertight containers, all of the hatches led to the interior. Only the tower hatch and the Galley hatches had ladders which led down to the main deck. Of course, a small enough man, greased with vaseline, could easily slide through the torpedo loading hatches
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Okay, a quick interior tour of the VIIC:
We start in the forward torpedo room. At the very front, we see the four bow torpedo tubes, which project about four meters into the pressure hull. There are six bunks on either side of this compartment, arranged 3X2. There are three mess tables bolted to the floor between the bunks, with hinged sides. Beneath the deck plates are four reload torpedoes. Fully loaded, there are two spares hanging from the overhead. To accomadate these, the upper bunks folded up. Naturally, the crew wanted to get rid of these torpedoes pretty quickly
Aft of this, we come to the Chief Petty Officer's quarters. As you walk through the hatchway, you see the forward head to port, a provisions locker to starboard. There are four bunks here, two on either side on top of each other. Another mess table is bolted here.
Pass through another hatch, we come to the Officer's Mess. There are four bunks, the top bunk on the port side is usually folded up. A small mess table is bolted to the floor on the port side.
Passing through a curtain, we see the Captain's "cabin", and the radio and hydrophone shacks to starboard.
Continuing through a round watertight hatch, we enter the control room. For reasons of space, I won't elaborate, but the control room contains: A rudder stand, the planesman's station, the search periscope, the bilge pump, the auxilliary pump, the chart table, the ballast controls, and the electric gyrocompass.
Another round hatchway, and we enter the Petty Officer's Quarters. To starboard is the boat's only refrigerated compartment. There are four bunks to either side, and two hinged mess tables bolted to the floor.
Next aft is the tiny Galley. Along with the small stove and a sink, there is a provision locker to Port, and the aft Head to Starboard.
Now we enter the Diesal engine Room, with two seriously honking huge diesals on either side. Along with the diesals, there are two motor oil coolers.
Next aft is the electric motor room, with the electricic motors to port and starboard. A bit further aft, we see two air compressors. An electric-powered compressor is to port, a diesal-powered to starboard.
Finally, we come to the aft torpedo tube. There is a single spare torpedo housed beneath the floor plates in the E-motor room.
Whew! That was longer than I'd thought. Keep in mind, that this all in a 144-foot long pressure hull, that averages ten feet wide, that houses 44 men!