It is quite possible and very easily.
Returning patrol, I stopped at Bordeaux for refueling.
Then I returned to my base, Wilhelmshaven.
Only one road: the Channel.
Watch it on the pics.
The beginning of the trip is easy to do, while surface and good speed.
It further increases the speed to go to Boulogne
The "S-Boot" protect our trip.
Now, en route to Calais.
We remain very near the coast
En route to Dunkirk, full speed and surfaced yet !
August 40, it's actually the battle for Brittain. Raid over England.
From here to Wilhelmshaven, there is no more problem. We went through !
And we return home three days after leaving Bordeaux.
It was between August 12 and August 15, 1940.
That's all.
