Just curious, at least before D-Day turned France into a hotzone, was civilian travel possible at all between Ireland and France ca. 1940-1944?

I know there were definitely Irish nationals living in France when it came under Nazi occupation, and being neutrals they weren't interned (unless they held British passports), so I got to wondering whether Irish people could get in or out during this period. If so, how did they travel? Could you get a boat direct from France to Ireland at the time, or did you have to take a more roundabout way? The Channel and the North Atlantic was full of mines, uboats, etc, so it would've been a risky trip if it did happen.