On 4 June 1996, the Ariane 5 rocket carrying the first four Cluster spacecraft exploded 37 seconds after launch. The Cluster mission to study the Earth's magnetosphere was delayed for four years while the spacecraft were rebuilt.
Some of the pieces of the original spacecraft live in my new lab at Imperial College. The damage an exploding rocket can do to a fairly sturdy electronics box is pretty impressive.
Sections of the experiment boom with ruined shielding & electronics box