Mystery behind Amsterdam explosions revealed

Passersby on the Rokin in Amsterdam should not be alarmed if they hear large bangs from underground. Dynamite is being used to demolish support walls in the construction of the Noord/Zuidlijn metro line. The explosives ensure that the 28 temporary support walls get demolished quickly and efficiently. According to Ries Jelier, supervisor of the Noord/Zuidlijn, the bangs are similar to thunderstorms. In order to limit the inconvenience and confusion, the explosions will only happen between 11:00 am and 13:00 pm. https://www.youtube.com/watch?v=InTK9vhPbfc