This is the main commandpost for the airdefence of St Nazaire. It is N 304, which can be found at the Route Eugène 5 at Saint Marc. In order to enter you need the right person present. Henk Adriaanse had that luck in 2005, so he took all the pictures and helped us with this special. You can follow a virtual tour by following the order as given in the lower left frame.
When you are cruising St Marc and are looking up for the tower, please look down too.