This was a guided tour of the future main station in Stuttgart called Stuttgart21.
More pictures: https://imgur.com/a/8QnDQrO
(Disclaimer: The descriptions could be wrong for the east/west orientation :P)
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it's famous for being almost 5 billion € over the initial budget of 4.5 billion.
The initial budget was 2.5!
It's like any budget planned in Germany (or the world) for mega projects like this.
But I can understand that considering this is (according to the guide) basically a full concrete-slab and cube underground made in basically one pour.