My favorite datacenter disaster story (that I was a critical actor in) was the AIS datacenter in San Diego - in short, a $0.25 bolt sheared off at a junction for the utility water supply fill for the cooling system system, after years of cavitation induced vibrations at a joint, and the roof turned into a swimming pool. Nobody knew this was happening as the gutters were fully enclosed, so it just filled and filled. Only when the leak became larger than the utility supply did the cooling system vapor lock, emergency stop, and the whole DC heat-soaked in minutes at 140F in the aisles (recorded by my recently installed temp meters). I was on call that night and saw the alarm of 78F, 90F, then 99F, and got in the car to head over there. It was 2am and the lone security guard had opened all the utility doors. I didn't even have to badge in to walk over to my row. I did notice the sound of rushing water as I passed the downspouts but there was a restaurant nearby with a water feature so, in their defense, it did mask it quite well.