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