400-Year-Old Elizabethan Padlock Opened Using Advanced Micro-CT Imaging Technology
Researchers cracked a four-letter combination on a shipwreck lock using non-destructive digital scans.
1Shipwreck Treasure Recovered
The brass padlock originated from the Ann Francis, a merchant ship that sank off the coast of Wales in 1583. Discovered by metal detectorist Peter Hughes between 1996 and 2017 on Margam beach, the lock was part of a larger hoard including gold and silver coins recovered from the wreckage site.
2Advanced Imaging Technique
Researchers at Cardiff University and Amgueddfa Cymru utilized micro-CT scans to examine the lock's internal mechanisms. This technology, typically reserved for biological structures, creates thousands of X-rays to form a 3D digital image. This allowed the team to map internal notches to external letters without risking damage to the artifact.
3Cracking the Code
By analyzing the 3D digital model, the team identified the correct four-letter combination as ANCE. This process avoided the risk of damaging the lock, which contained grit inside the dials. Before this digital intervention, the lock had remained firmly sealed for over four centuries, presenting a persistent historical mystery to curators.
4Merchant Smuggling History
The Ann Francis was owned by Francis Shaxton, a merchant and notorious smuggler. While claiming to sail between English ports, the ship was actually transporting wheat to Spain. Spain relied on these grain shipments and paid using gold and silver acquired from colonial conquests in Central and South America during that era.
5The Final Voyage
On December 28, 1583, the ship encountered a violent storm while returning from Spain to England. The vessel ultimately wrecked off Margam beach. A local parish register recorded the loss of 14 sailors during that same month, with some contemporary accounts blaming the tragedy on the work of a supposed witch.
6Post-Wreckage Looting
Following the disaster, local residents looted the wreckage before a legal dispute emerged regarding ownership. A Welsh lord impounded various items, including cannons, guns, and three chests with broken locks. Experts believe the newly opened padlock may have originally secured one of these chests before being separated from its contents.
7Exceptional Preservation
Despite spending over 400 years beneath the sands, the lock remained in remarkable condition. Peter Hughes noted that the ring dials turned with ease when he first discovered the object. Its survival is unique, as Elizabethan combination locks are rare, and this specific example is tied to a precisely dated maritime wreck.
8Unresolved Historical Questions
While the combination has been successfully deciphered, the significance of the code ANCE remains unknown. Researchers now speculate whether the letters held personal meaning for the owner or served a functional purpose. The lock is currently held by Amgueddfa Cymru, providing a tangible link to the illicit trade of the Elizabethan era.