In 1999, workers taking a boiler out of service at a power plant in Dearborn, Mich., mistakenly blew natural gas from the surrounding pipes into the boiler, where it built up, met with something hot and exploded. Six workers died and 38 were injured.

In 2007, two plumbers, in a process known as purging, pushed natural gas through new piping and into the interior of a hotel under construction in Cheyenne, Wyo. They did not smell the gas as it filled the room; it exploded, severely burning them both.

Source: New York Times

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