Testing a fuel cell (© IMGW)

Entrance to A001A inside bunker (© IMGW)

Installing A001A inside bunker (© IMGW)

Castle housing A004A (© IMGW)

Components of A004A (© IMGW)

Fixing antennas for A005A (© IMGW)

Installation von A005A (© IMGW)

Winter impressions of A005A (© IMGW)