http://3cbzkrvakrpetjjppdwzbzqrlkmzatjs7jbyazap5gwutj32gcltjpqd.onion
At least in the end, the total delay was only one hour when finally arriving at the destination. Due to the French julliet quatorze fireworks approaching, buses in Brest were rerouted, but I managed to catch the right bus to the conference venue, already meeting a few Debian people on the way.