Eisenbahn-Bundesamt
Also in April 2016, press spokesman Daniel Abbou was fired after giving "too honest" an interview. He had stated that billions of euros had been squandered, and that only someone "dependent on medication will give you any firm guarantees for this airport." On 25 April 2016, Mühlenfeld stated that "surprisingly, demands (towards a simulation of the problem) are higher than expected." In fact, the Federal Railway Authority demanded that the commuter trains be simulated at speeds up to when entering or leaving the station. This means it would take more time to simulate the exact solution for the underground railway station. The Federal Railway Authority also called for the simulation of emergency/evacuation scenarios. To prevent suffocation in an emergency, glass towers are to be built inside the railway station that connect to openings in the roof, which will provide fresh air. Mold seems to be persistent, the railway station is already ventilated from time to time by mobile fans.