This Day in Failure: July 31

1999: The Lunar Prospect spacecraft crashes into the moon 18 months after its launch.

1975: Teamsters Union president Jimmy Hoffa is reported missing in Detroit, Michigan.

1715: A hurricane strikes the east coast of Florida, sinking 10 Spanish treasure ships (including the Nuestra Senora de la Regla and Santa Cristo de San Ramon), killing nearly 1,000 sailors and resulting in the loss of tons of gold and silver coins.