Mexico

The April 20, 2010 Deepwater Horizon explosion in the Gulf of Mexico killed 11 workers and began an 87-day oil release that ended when the Macondo well was capped on July 15, 2010. BP, Transocean and Halliburton's failures are documented in a presidential commission report and in federal court findings. BP also pleaded guilty to obstructing Congress over its statements about how much oil was flowing, and a federal judge wrote that BP lied about it. The claim that U.S. agencies helped hide the spill's scale is not supported by the records.

The 1947 crash of a high-altitude Project Mogul balloon near Roswell, New Mexico that was briefly described by the US Army as a recovered "flying disc" before being reclassified as a weather balloon — and later, in 1994, as a classified Soviet nuclear-test surveillance balloon.