The city grew rapidly and around 1878 more than 22,000 people were already living in Den Helder. Because the big ships still had to circumnavigate to get to Amsterdam , Amsterdam decided to dig its own canal directly to the North Sea, the North Sea Canal . This was not good for Den Helder; many ships now passed the city. The large offices of the shipping companies moved to Amsterdam and many shops and businesses disappeared. The navy and the state yard remained in Den Helder and offered work to more and more people. The Second World War also had major consequences for the residents of Den Helder. The naval city was taken by the Germans and Den Helder has often been bombed by the English in an attempt to expel the Germans. Many residents fled the city. For example, 1,500 people from Den Helder came to Schagen. The municipality of Schagen did not immediately have housing for all these people and built new houses for the refugees. In 1943, the Germans began to demolish Oud Den Helder, including the entire Kanaalweg and Hoofdgracht with beautiful old houses from the 19th century. In total, more than 2,200 houses were demolished by the Germans, to make room for the construction of large defenses along the coast, the Atlantic Wall. These were major obstacles and bunkers to prevent the English and the Americans from attacking from the sea. After the war, Den Helder was rebuilt into a large naval city. The people who had fled during the war returned. From 1950 Den Helder started to get bigger. Today, approximately 56,000 people live in Den Helder.