Staircase on poop deck

Nov 13, 2014
336
18
48
Belgium
Hello guys,
On the Titanic deck plans available on this site, I noticed there was a staircase on the poop deck, right below the bridge.
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It apparently leads to a room below where the steering engines and gear are located.
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I was hoping someone could show or tell me how this staircase looked like. I have never heard about it before because it was apparently not on the Olympic. How did they prevent Third Class passengers from accidentally going down there?
 
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