Everyday hundreds of people walk past a green door in the Gesundbrunnen underground railway station, unaware that within lies a subterranean labyrinth full of history just waiting to be experienced. Berlin was the nerve centre of the Third Reich and therefore one of the main targets for allied bombing during WW II. On this tour our expert guides will lead you in exploring one of the few remaining bunkers, as it was left after the war. There you will learn more about the life of the average Berlin citizen during the air-raids that destroyed up to 80 % of the city’s centre. Travelling through the twisting passages and rooms, you will also see countless artefacts from the war that have been buried for decades. Additionally, by looking into the development of the city's subway and sewerage systems as well its former pneumatic post, we will provide you with an insight the 160 year old underground history of Berlin.