42. Hangzhou Subway Tunnel

Location: Zhejiang Province, China

Year of Fail: 2008

In 2008 a section of subway tunnel under construction caved in creating a giant sinkhole that swallowed both construction staff working underground and passengers in cars from the road above. Buried underneath steel beams and rubble, 21 people were killed and 24 were injured. In addition to a flimsy system of supports and moldings, the tunnel had been built over unstable, swampy ground. Suggestions to build elsewhere were ignored due to the interests of real estate developers.