Watch VoirFilms. Probably the most difficult construction site in Germany is 70 kilometers from Sylt. The sea is up to 32 meters deep and the waves are high even in good weather. A wind park with 80 turbines is being built here under harsh conditions, which will generate climate-friendly electricity for a million people. A mammoth project that is hard to beat in terms of size and complexity. And things are progressing rapidly: specialists erect the almost 150-meter-high wind turbines within a day.