0  = Air Duct
1  = Living Quarters
2  = Science Lab
3  = Workshop
4  = Standard Sonar
5  = Wide Area Sonar
6  = Torpedoes Defence
7  = General Store
8  = Alien Containment
9  = Gauss Defence
10 = Sonic Defence
11 = P.W.T. Defence
12 = Bombardment Shield
13 = M.C. Generator
14 = M.C. Lab
15 = Transmission Resolver
16 = Sub Pen Top Left
17 = Sub Pen Top Right
18 = Sub Pen Lower Left
19 = Sub Pen Lower Right
