I tried something similar for my test mission
[Unit]
ClassName=NormalSubBaseGe
UnitType=406
MaxSpeed=0.000000
MinSpeed=0.000000
Length=1
Width=1
[AirGroup 1]
StartDate=19410102
EndDate=19430101
Squadron1Class=Resupply Uboat
Squadron1No=1
And didnt spawn anything - using a regular AI sub though
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