I explored the conning tower of the NJ today. I'm not overweight but there were some tight squeezes that I barely fit through.
The O1 level has the G-2 Div. Office and RATO magazine.
The O2 level has the air intakes to Fire Room #1. They have been plated over, presumably to keep water out. There are two protected pits of death leading down to the boilers.
The O3 level is empty except for the armored door operating machinery that does not take up much space.
This the starboard side of the O2 level of the conning tower. The air intake has been plated over. During WWII a shield was added externally below the side windows of the admiral's bridge. It looks like the intake was sealed to keep water out. The ladder with a big gap at the bottom leads to the O3 level. The port side is the the same minus the ladder.
The armored tube to the conning tower is out of sight to the right. There is another armored trunk at the back end that from the armored section at the O4 levels down to the O2 level, comes and follows the overhead of CEC, goes out aft under and connecting the forward MK38 and MK37 director trunks.
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Behind the expanded metal grating there is a pit of death leading all the way down to the boiler.
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This is the port side at the O3 level. At each level there are two transverse bulkheads and one centerline bulkhead. As you move up, the two outer areas at each deck get narrower. This taken from the forward end of the middle section. The door leading to the admiral's bridge is visible through the arch. On this side there is door opening machinery that takes up very little space. The starboard side is empty.
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The O2 and O3 levels on the NJ are pretty much just empty space.
It's tough to get good pictures because the space is so cramped.