Yes… the Submarine gets to shoot at my transport during combat (and i should not have brought the transport along)
No… I may not land my troops after the surface warships are cleared, simply because there was a battle in the first place and the sub is still there
Yes… I may retreat my dumb transport and fighters
Axis_roll is correct. Sea units may not enter or leave sea zone 16 under this optional rule. Bulgaria/Romania being cut off from the Mediterranean is just a by-product of the way the map is drawn.