Sponge divers hauled a corroded bronze lump from a 1st-century-BC wreck in 1901. It hid more than 30 gears that tracked the sun, moon and eclipses - a thousand years ahead of anything else on Earth.
The full overview: 82 corroded fragments, dozens of bronze gears, and the reconstruction of the world's first known analog computer.
A short TED-Ed primer on how the device was found and why it rewrote the timeline of human technology.
fern's beautifully animated dive into how the gears worked and why nothing comparable appears again for over a millennium.
A BBC Reel on the discovery in the 1901 shipwreck and the century of study that followed.
Tony Freeth and UCL colleagues' peer-reviewed paper reconstructing the front gearing - the first model to fit all the surviving evidence.
How researchers recreated the planetary display, showing the sun, moon and five planets on concentric bronze rings.
An hour with the researcher who cracked much of the gearing, on how the puzzle was finally pieced together.
Clickspring's experimental archaeology: recreating the mechanism's precision parts using only techniques available in antiquity.