Welcome, Exterminate!
@Exterminate:
If a territory with a naval base is captured what happens to the naval mines? Does the ownership of the mines change, or are the mines negated, or do they still belong to the original owner of the territory?
Mines are active only when the territory with the naval base is either contested or controlled by its original controller. If the territory is controlled by an enemy power, the mines are inactive.
@Exterminate:
Can an unescorted transport move through a sea zone containing a submarine?
Yes, as the sea zone is not hostile.
@Exterminate:
Planes have a range of 2. Does that mean they can attack with one movement then retreat with the remaining 1 movement, as with WW2 rules?
No. There is no noncombat movement in this game.