It is December 22nd, 1942, that the General Dornberger was convened with the Minister Speer to a meeting to the Ministry of the Armament in Berlin, to receive Hitler's order there to build in the North of France a Bunker for the assembly and the launch of rockets of the type V2 for the attack of England.

This decision was the conclusion of a large number of reports which had been made by Dornberger, Von Braun and the technical services of Peenemünde on the development of the rocket V2.

A long discussion had taken place between the partisans of the launch of rockets from strongly protected bunkers or on the contrary, from units of shootings, light and mobile, easy to hide in forests.

The strongly protected Bunker was chosen because the regulation of the rocket before its departure asked for numerous rather delicate controls, easier to execute under cover rather that in the nature. The technicians of Peenemünde thus construirent a model.

A first project, a sketch and photos of the model of which we found, contained inside a bunker all the elements allowing to make the assembly of rockets, to verify them and then to raise them by an elevator on the roof, where they would have been firings and sent towards their objectives. 

Another very similar project planned, instead of taking out the rocket by the roof, to moving it vertically inside the bunker, to taking out it by side doors and to making it leave satellite platforms situated outside of the main bunker.

 
It did not any more remain in fact than to find a place which can allow the realization of such a project.

It is to Oberstleutnant Thom that was confidedthis research.

The measures foreseen for the building are the following ones: 
216 m of length
95 m of wide
33 high

   There was certain number of criteria important to satisfy:

One needed that a relatively easy accessibility by railway and possibly by waterway because of the considerable contribution of materials which was going to require the construction of a bunker of this size.

Having examined certain number of places, it is the region of Eperlecques that was held.
Indeed, there was a double railroad which gatheredSaint-Omer in Calais, a navigable channel for barges with big size, a situation in a forest in contrepente with regard to England, a food in very favorable electricity with lines with high voltages which passed in this sector, and finally a very satisfactory road network in all the region.

 
In March, 1943 the works begin then …