SpaceX's Crew Dragon Exploded due to Oxidizer Leaking (2019)
SpaceX released a report on their analysis of the '4/20' Anomaly that destroyed their Crew Dragon spacecraft during a ground tests.
2019-07-16 18:00:00 - SpaceX
It was the result of oxidizer leaking into the wrong part of the plumbing and then being propelled through the system.