Here is my 100% Achievement guide for Deliver Us The Moon!
In Chapter 1, there will be a set of stairs you need to move to get through that door.
Turn on your torch, go left and up and you will reach a canteen looking area.
At the opposite end of where you enter on the right hand side is another door to go through and the first of many audio logs will be in plain view, basically unmissable!
Go to 10:50 in the video to see where it is.
Hope This Helps!