IIA = 152
IID = 157
VIIB = 225
VIIC = 247
VIIC/41 = 247
VIIC/42 = 247
IXB = 216
IXC = 232
IXC/40 = 232
IXD2 = 235
XXI = 285
taken from:
http://www.communitymanuals.com/shii...tle=Submarines
As it says on that page: "Source: SH3 Manual and for Max Depth SH3 Crush Depth Tool. IXC/40 VIIC/41 and VIIC/42 Found Experimentally."