Panel says contractor caused fatal Singapore tunnel collapse

Japan's Nishimatsu Construction Corporation and three of its senior officials are being seriously prosecuted and possibly blacklisted with the involvement in the construction and subsequent collapse of the 100-meter rail tunnel in Singapore on April 20, 2004. The official investigation revealed that the tunnel work was undersigned and poorly executed which indicated that a more serious accident must have took place if the project was not interrupted by the accident that killed four people.