To the north of the bunker, the Germans erected a bomb-proof power station with a generating capacity. The site was initially powered from the main electricity grid, but it was intended that it would have its own independent power source to minimise the likelihood of disruption. Also associated with the Watten complex was a radar tracking site at Prédefin, south of Saint-Omer. A Giant Würzburg radar system was installed there to follow the trajectories of V-2s being launched from Watten. The intention was to follow the trajectory for as long as possible so that the accuracy of the missile launches could be determined.