There are regular reports of explosive finds from the Second World War along the Dutch coast. In the spring of 2000, nineteen mines from the Second World War were found in Egmond aan Zee. There is a mini submarine of the type 'Seehund' lying in sea close to the nude beach. According to the commander of the submarine and the Historical Society of Egmond, unexploded torpedoes still hang under the submarine.
At the end of July of the same year, a hand grenade was found on the busy beach between Zandvoort and Bloemendaal. One week later, more unexploded explosives were found, including an anti-tank mine. The explosives come from an explosion well made by the allies and probably surfaced due to displacement caused by natural dynamics. The well is a deep hole in which unused ammunition and explosives were detonated at the end of the war. However, not all exploded. Instead, they were slung out over a large area around the well. For safety reasons in 2000, a strip of beach almost a kilometer long was evacuated for the entire summer and provided with a dam wall until the entire beach had been scoured.
Ten to twenty thousand tons of explosives were detonated in such wells after the war. The exact locations of the wells are often unknown.