The coastline to the west of Calais is lettered with dozens of Widerstandsnests and Stutzpunktes (Stp strongpoints) along its cliffs, with some more developed than others.
Wn102 Berlin is one of the smaller resistance nests on the coast although it did feature two large R612 type casemates – facing east and west along the beach – with 7.5cm field guns housed within each.
The western casemate is largely covered by beachfront accommodation, but you can still see the eastern casemate clearly along with a small personnel and storage shelter.