lurker_hlb3 did a lot of single runs of RGG in the Med, which followed "historical" runs, so most of the traffic is rather sporadic, except in support of other operations. However, there is some random groups that cross the Med and travel along the coasts. None of this was changed for Dark Waters, so as in real life, there will be day upon day of boredom, followed by interminable hours of sheer terror...
That is a photo-stitch of three of the layers for the Med, gotten from the Mission Editor.