Apollo One 50 Years -- January 27, 2017

Fifty years ago today, on 27-January-1967, during a rehearsal, the cabin of the Apollo One capsule caught fire.  The crew, Gus Grissom, Ed White and Roger Chaffee, all died.  I don't think I remember the day, but I remember reading about the findings of the committee that investigated.  The atmosphere was pure oxygen.  The cabin contained flammable material.  The inner hatch couldn't be opened from the inside because the pressure was higher inside the cabin. 

This was NASA's only fatality in a spacecraft before Challenger in 1986.