Yes, they can do that even if the powers are at war. The presence of a sub belonging to an enemy power does not block movement.
Marsh
Can someone please write down the numbers of neutrals because staring at the screen gives me a headache
Numbers of inf
Chile:2
Argentina: 4
Brazil: 3
Venezuela:2
Spain: 6
Portugal: 2
Switzerland: 2
Sweden: 6
Finland: 4
Yugoslavia: 5
Greece: 4
Bulgaria: 4
Turkey: 8
Iraq: 3
Persia: 2
Saudi Arabia: 2
Afghanistan: 4
Angola: 2
Mozambique: 2