Hoge Zeedijk (Schielands High Seadyke) along the river Hollandse IJssel was all that protected three million people in the provinces of North and South Holland from flooding. A section of this dyke, known as the Groenendijk, was not reinforced with stone revetments. The water level was just below the crest and the seaward slope was weak. Volunteers worked to reinforce this stretch. However, the Groenendijk began to collapse under the pressure around 5:30 am on 1 February. Seawater flooded into the deep polder. In desperation, the mayor of Nieuwerkerk commandeered the river ship de Twee Gebroeders (The Two Brothers) and ordered the owner to plug the hole in the dyke by navigating the ship into it. Fearing that the ship might break through into the polder, Captain Arie Evegroen took a row boat with him. The mayor's plan was successful, as the ship was lodged firmly into the dyke, reinforcing it against failure and saving many lives. The Afsluitdijk across the entrance of the Zuiderzee was said to have paid for its construction cost in that one night, by preventing destructive flooding around the three great meers that used to be the Zuiderzee. Reaction Several neighbouring countries sent soldiers to assist in searching for bodies and rescuing people. The U.S. Army sent helicopters from Germany to rescue people from rooftops. Queen Juliana and Princess Beatrix visited the flooded area only a few days after. A large aid program, the National Relief Fund, was launched, and soldiers raised funds by selling pea-soup door to door. Internationally, 100,000 commemorative postcards, featuring an illustration by Eppo Doeve, were sold. A national donation program was started and there was a large amount of international aid. The Red Cross was overwhelmed by contributions, and diverted some of the funds to assist residents of Third World countries. It was found that the flooding could have been higher; the Rijkswaterstaat's plan concerning the protection and strengthening of the dikes was accepted. As a result, the Delta Works were authorized, an elaborate project to enable emergency closing of the mouths of most estuaries, to prevent flood surges upriver. Britain The North Sea flood of 1953 was the worst flood of the 20th century in England and Scotland. Over of coastline was damaged, and sea walls were breached in 1,200 places, inundating . Flooding forced over 30,000 people from their homes, and 24,000 properties were greatly damaged. The damage