450 feet that's a lot, here's the cfg :
[Properties]
PeriscopeDepth=20.3;meters
SnorkelDepth=15;meters
CrashDepth=40;meters
MaxDepth=
100;meters
SurfaceDepth=4.5;meters
TorpLaunchMaxDepth=40;meters
StormConditions=7,0.1;max wind speed [m/s], max rain intensity [0,1]
peri depth needs to be changed too (Iset it deep so the radio mast would'nt show, but since I now have removed it..)
from Paul Kemp's book "The T-Class Submarine" naval press :
