The National Museum of Computing in the UK has restored to working function a WWII-era code-breaking computer.
The Tunny machines, like the Colossus computers they worked alongside, were dismantled and recycled for spare parts after World War II.
The first Tunny machine was built in 1942 by mathematician Bill Tutte. He drew up plans for it after analysing intercepted encrypted radio signals Hitler was sending to the Nazi high command.
A great look back at an amazing machine built of necessity. Be sure to watch the video to get an idea of how the Tunny worked.