Metal fatigue at a fuselage joint of the Boeing 737 operating Southwest Airlines Flight 812 caused a rapid decompression of the passenger cabin and an approximately 60-inch-long hole in the aircraft's fuselage skin.
National Transportation Safety Board
NTSB Report AAB-13-02 <a rel="nofollow" class="external free" href="https://www.ntsb.gov/investigations/AccidentReports/Reports/AAB1302.pdf">http://www.ntsb.gov/investigations/AccidentReports/Reports/AAB1302.pdf</a>