Bunker SB A is located at the edge of the road in a meadow between the villages of Ménobu and Becco. The bunker belongs to sector Sougné-Becco (SB) of the 1st line of defense for the city of Liège, la Posistion Fortifiée de Liège 1, (PFL 1).
It a smaller bunker with one gun opening for a machine gun or cannon. The bunker is not accessible. The walls of the bunker are of reinforced concrete, 1,3 meters thick on all sides.
Interestingly, there are no ventilation holes above the gun opening. As several other bunkers in this line, it would have "open doors. These would then be a lamella door on the inside and a barred door as the outside door. These were smoke gas-permeable. The smoke gases generated when the machine gun was fired could escape in this way. See, for example, bunker SB 9 for what these doors looked like. Also the openings for the grenade gully's for proximity defense are missing on this bunker.
As with most bunkers, after the war when the bunkers had lost their strategic value, the metal hatches and doors were removed and sold as scrap metal. It also happened that during the war the bunkers were stripped of iron by the Germans and melted down for other purposes. If cast-iron observation turrets were present, they were reused at the atlantikwal, among others.
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