Souterrain
In the evening of 13 September 2018 the underground part of gun position 4 was open for public.
This is much information and equipment on display.
A workman of the Organisation Todt.
The layout of a telephone cable with 354 pairs. Two pairs are jointed in a quad.
The airfilter system in the M 151.
Crewquarters. Behind the low wall is the room for the central heating.