Today's version of the Colossus took 14 years to assemble, according to Anthony Sale, who headed the team that rebuilt the computer.
"All the drawings were burnt in 1960, so all we had to go on were 6 black-and-white photos and 10 fragments of circuit diagrams," Sale said. "The machine has 2,500 valves, so it was a challenge piecing it all together."
Credit: Bletchley Park Trust
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