Layout map of the Fortress. The red areas represent underground works, the blue represent the parade grounds and access roads.

1 - Gun Emplacement #1

2 - Magazine #1

3 - Magazine #2 (originally #1)

4 - Gun Emplacement #2 (originally #1)

5 - Command Post

6 - Gun Emplacement #3 (originally #2)

7 - Magazine #3 (originally #2)

8 - Battery HQ

9 - Mess

10 - Ablutions and similar facilities

11 - Barracks

12 - Rec Room

13 - Q.M.

14 - Battery Observation Post

15 - Miniature Range? (possibly the original Plotting Room)

16 - Original Radio Room

17 - Underground Plotting Rooms

18 - Officers Mess

19 - Lower Parade Ground

20 - Parade Ground

21 - Barracks

22 - Barracks