There's a podcast on this. "How to fuck up an airport". The short answer is that all the bids were realistic-ish, and therefore too high for the budget. So the

There's a podcast on this. "How to fuck up an airport". The short answer is that all the bids were realistic-ish, and therefore too high for the budget. So the Berlin politicians went "We'll do it ourselves! Much cheaper!". And lo and behold...