Deadly sinkhole: A sinkhole opened up suddenly in a sidewalk in a commercial district of the Chinese city of Dazhou this week, sending four people plunging 30 feet to their deaths. Two victims, a recently married couple, were pulled alive from the pit but later died in the hospital; the bodies of the other two, a man and his son, were retrieved later. Authorities evacuated nearby buildings, fearing that the 100-square-foot sinkhole might expand. Sinkholes are often formed when acidic rainwater dissolves limestone or similar rock beneath the ground, leaving a void; shoddy construction planning and poor drainage can exacerbate the problem.
Heading into the hole