Beginning in 1930, the "bonifica idraulica" cleared the scrub forest, constructed a total of of checkerboard canals and trenches, dredged rivers, diked their banks, filled depressions, and constructed pumping stations to change the elevation in the canals where necessary. The final channel, the Mussolini Canal, empties into the Tyrrhenian Sea near Anzio. The project reached a peak in 1933 with 124,000 men employed. The previous agrarian population was moved out under protest in the name of progress. Workers were interned in camps surrounded by barbed wire. The camps were overcrowded, wages were low, hours were long, food was bad, sanitation was poor, healthcare was missing, and medical attention was lacking. Workers could quit, however, and turnover was high. In 1935, at the completion of the phase, they were all dismissed without notice. Many were infected with malaria.