The Viking Ship Museum in Denmark recently announced an unprecedented discovery in the Øresund Strait: the world’s largest and most advanced medieval cargo ship ever found. Hailed as “a milestone in maritime archaeology,” the discovery occurred while divers were investigating the seabed in the Sound, in anticipation of Copenhagen’s new Lynetteholm district, and stumbled upon a record-breaking cog buried beneath centuries of sand and silt. Found approximately 43 feet deep, the precious wreckage escaped destructive forces, resulting in an extraordinary state of preservation that provided archaeologists with a rare, close-up look at never-before-seen details. “It is extraordinary to have so...