BMW has released a video showing some details of its secret Plant Zero manufacturing plant in Munich, Germany. This is the factory where one-off prototypes are built as well as testing mules for upcoming models.

BMW Plant Zero

There are a few cars previewed in the video, including what appears to be a next generation F30 BMW 3 Series being put together. Take a look below, it's quite interesting to see how some cars are engineered and put together by hand.