16th-century shipwreck found during Swedish naval exercise

A Swedish naval vessel found an unidentified 16th-century shipwreck in Kalmar Strait, where officials have placed the protected site off limits.

An unidentified shipwreck believed to date to the late 1500s has been found off Sweden’s southeastern coast, officials announced Tuesday, after a navy vessel detected it during a military exercise.

The wreck was discovered by HMS Belos in late 2025 in Kalmar Strait, the waterway between Sweden’s southeastern mainland and the Baltic Sea island of Oland. The County Administrative Board in Kalmar said analysis of wood from part of the wreck indicates the ship was built in the late 1500s.

The finding could make the vessel older than Sweden’s famed 17th-century warship Vasa, which is displayed in Stockholm after being salvaged in the 1960s. The ship has not yet been identified, and officials have not released details about its origin, cargo or how it sank.

“After dendrochronological analysis of part of the wreck, results indicate that the ship was built in the late 1500s,” the County Administrative Board said, referring to the scientific method used to date wood and trees.

Antiquarian Daniel Tedenlind said in the same statement that the wreck is “of significant cultural historical value.” Officials described it as a discovery that could provide rare historical and archaeological information.

The site has been designated a historic monument and is being monitored by the coast guard. Diving, fishing and anchoring are prohibited near the area, a restriction meant to protect the wreck while authorities assess it.

The Baltic Sea has yielded a number of well-preserved wooden wrecks, aided by brackish water, cold temperatures, darkness and low oxygen. Other finds in the region in recent years have included centuries-old artifacts from an ancient wreck and a cargo of champagne and wine discovered by divers off Sweden in 2024.

For now, the central questions remain unanswered: which ship this was, what it was doing in the strait and what further study may reveal about Sweden’s maritime past.