A 13th-century English ship sat on the bottom of the English Channel for over 750 years, hidden in plain sight. Divers had written it off as modern construction debris—until 2019, when archaeologists took a closer look and found themselves face to face with one of England's oldest surviving ship hulls.
The Mortar Wreck, named for its cargo of grinding stones, went down around 1250 with a hold full of Purbeck stone—a heavy, marble-like material that medieval builders couldn't get enough of. "The 13th century is the heyday of the marble industry," says Tom Cousins, a maritime archaeologist at Bournemouth University. "You won't find a church or cathedral that doesn't have Purbeck marble in it." Westminster Abbey, the Tower of London, even cathedrals as far away as Denmark carried this stone across the medieval world.
Located about a mile off the Dorset coast, the ship was built from Irish oak and designed to carry serious weight. But the Mortar Wreck may have been carrying too much. Researchers found a crack in the hull, suggesting the vessel—a souped-up variant of a Viking ship design—buckled under its estimated 29.5 tons of cargo. The stone it was meant to deliver never arrived.
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Start Your News DetoxWhen Cousins and his team first inspected the wreck, their skipper asked if they'd ever dived the site before. "We said, 'No, because it's rubbish, there's nothing there,'" Cousins recently told the BBC. It's easy to understand why. Medieval wrecks don't announce themselves. They blend into the seafloor, accumulate sediment, and start to look like any other pile of old material.
But once they started documenting the site properly, the finds kept coming. Portions of the hull itself. Grinding stones. A pair of grave slabs carved from Purbeck stone with ornate masonry that matches the craftsmanship of 13th-century tomb work—including one that resembles the artistry on the tomb of Stephen Langton, Archbishop of Canterbury from 1207 to 1258.
Much of what was recovered now sits in the Poole Museum, where visitors can trace the medieval stone trade that shaped England's greatest buildings. "When we first heard about the discovery, we were just so excited to play our part in the whole story," says Joe Raine, the museum's collections officer. For people who know nothing about medieval seafaring or the reach of Purbeck stone, the Mortar Wreck tells a story that's been underwater for centuries—finally visible again.
