the other at 2 miles in length, by dumping 20-ton concrete blocks in the Mediterranean Sea. The blocks were produced in an assembly line with mechanical elevators to pour in cement, lime, and water. After curing for two months in wooden frames, they were lifted on to barges that dropped them into the sea. 30,000 blocks were used in the jetties. In 1867, the company began to develop its fee structure in preparation for opening. During this same year the company had already started to charge fees for transport of goods across the northern almost-completed portion to the separate southern access canal, garnering millions of francs in annual revenue. The company estimated that of the 10 million tons of annual goods shipped around the Cape of Good Hope, half would pass through the canal. After some complaints, a figure of 10 francs per ton and 10 francs per passenger was announced. Politically during this period, company workers experienced a cholera outbreak in 1865 that caused the deaths of several hundred Europeans, including Voisin's wife, and more than 1,500 Arabs and Egyptians. The Ottoman sultan approved of the French reconciliation framework in 1866. By 1866 there were about 8,000 Europeans and 10,000 Arab and Egyptians that had settled in the canal region. By 1867 and 1868 the total population in the canal region would grow to 26,000 and 34,000, respectively. As the diversity and number of settlers in the canal region rose, Ismail directed Nubar to begin his decade-long journey of revising the judicial system from a system of capitulations to a system of mixed tribunals. The company made an appeal at the 1867 Universal Exposition of Art and Industry to attempt to sell an additional 100 million francs (£4 million) worth of debt in the form of bonds – maturing in 50 years – to finish the project. Remaining unsold bonds were sold in lotteries approved by the French government. Two dams prevented the filling of the Great Bitter Lake and thus the completion of the canal, one to the north and one to the south. Rocky terrain was cleared on the Serapeum ridge to the north of the lake for a lake filling ceremony witnessed by Ismail in early 1869. The prince of Wales visited in the Spring of 1869 shortly after the initial lake filling ceremony but while the lake was still filling and toured the canal zone.