This is bunker CTF 4.
The bunker is part of the defense for the city of Liège, la Posistion Fortifiée de Liège, PFL.
CTF stands for 'Centraux téléphoniques' which can be translated as a bunker for telephone exchange. The bunker was not intended as a bunker in de line of defense or shelter. Within the PFL area there were 34 CTF-bunkers. They provided communication between the forts, bunkers.and secret underground telephonebooths T. and C5.
typical for this kind of bunkers is that they do not have gunopenings. On first sight one might think dat the opening next to the door was for a cannon or machinegun. But this is an escape hatch. The bunker is not accessible and still has it's original steel door.
The bunker is camouflaged in the typical redbrick patern so it would fit in with the houses in the area. The patern was carved in the cement. Also remarkable are the round arches with (phoney) key stone ont the window and door. And the cornice on top of the bunker. All to make the enemy believe this was a house instead of a bunker.
Telephone lines were burried as deep as 2 meters in between bunkers and the forts. Outside the forts the lines were burried even as deep as 6 meters. Out of precaution for the expected shelling of the forts with heavy artillary. At this depht the lines would be less vurnerable for the shells.
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