BREMEN, GERMANY // A gigantic bunker built during the Second World War to house a submarine assembly plant has opened to the public as testimony to the cruelty and fiendish technological capabilities of Nazi Germany.The massive site, named “U-Boat Bunker Valentin”, lies like a sleeping monster on the bank of the Weser river north of Bremen, about 40 kilometers from the North Sea coast. The bunker is 33 meters high and spans an area the size of six football pitches. Its roof, intended to withstand Allied bombing raids, is up to seven meters thick.The facility was built in just 20 months by more than 10,000 laborers drafted from all over Europe. The names of 1,200 who died from overwork, malnutrition, sickness and arbitrary killings are known. The true death toll is believed to be far higher.The Bremen regional authority and the national government launched a €3.8 million (Dh19.9m) program earlier this month to set up a museum at the bunker to explain its history. It will place an emphasis on addressing younger generations of Germans, some of whom consider the Nazi era to be an abstract historical experience endured by ancestors they never met.”The U-boat bunker Valentin was the monumental center of an inhuman network that exploited human labor for the purposes of National Socialist conquests,” Bernd Neumann, the culture minister, said in a speech to mark the opening of the site on May 8, the 66th anniversary of Germany’s capitulation.”Here, the whole spectrum of forced labour under National Socialism becomes evident, which makes Valentin an exceptional and educational site of remembrance,” Mr Neumann said.