I have a few questions.

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?

Can an unescorted transport move through a sea zone containing a submarine?

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?