 Complete the following phrase:  In 1585, the island was connected with the mainland through the building of a dam. Subsequent deposits of sediment by the sea created new land, which was further secured through dikes. Storm floods continued to take their toll as documented in the St. Clemens church with a tabloid commemorating the Burchardi flood of 1634 flood, which killed 168 people and destroyed 102 homes in Büsum. During the devastating Christmas flood of 1717, the village Werven near Büsum sank completely. The last 