a contract for 30 years of operation and maintenance. Construction costs were shared between the central government (79%), Kaohsiung City Government (19%), and Kaohsiung County Government (2%). Construction began in October 2001, with 66 shield tunnels () completed in May 2006. The cut-and-cover and bored tunnel methods were used for construction of the lines. In November 2006, the first trial runs began on the Red Line. In January 2007, the last concrete slabs were laid for the 37 planned stations. Scandals and major construction accidents In August 2004, a section of subway tunnel near Sizihwan metro station at the west end of the Orange line collapsed during construction due to loose sand underground and water break-ins. Four low-rise buildings near the collapsed tunnel had to be evacuated and later on had to be torn down due to major structure damages. The Kaohsiung MRT Foreign Workers Scandal, involving alleged inhumane treatment of Thai migrant workers, erupted in 2005. Investigation revealed kickbacks to politicians by the contractor. The scandal had tainted the public confidence in the construction of the system and prompted a diplomatic response by the Thai Prime Minister asking the migrant workers to return to Thailand. Chen Chu, the Chairperson of the Council of Labor Affairs of the Executive Yuan, resigned as a result of the scandal. In December 2005, another subway tunnel section of the Orange line at eastern Kaohsiung collapsed during construction. The collapse of the subway tunnel also brought about the collapse of a road tunnel above the subway tunnel. Several nearby buildings were evacuated for several days for inspection. It was estimated that the road tunnel could not be rebuilt and reopened for traffic for at least a few months. In January 2008 the section was still closed and traffic is diverted around the affected area. Opening Construction accidents delayed the opening of the MRT considerably from the originally planned December 2006 date. The Sanduo-Siaogang section of the Red Line was eventually opened to the public for free test rides during 8–11 February 2008, and the Red Line (except for 2 stations) opened for service on 9 March 2008. The Orange Line fully opened for service on 14 September 2008. Ridership Ridership has been far below expectations, with an average of 100,000 passengers per day versus an expected 360,000, and accumulated losses are expected to reach NT$6 billion by the end of 2009. , the average