We've found 3 million shipwrecks. Most are still secret

The Atlantic seabed off the Outer Banks of North Carolina holds a silent city of iron and timber. Over 2,000 vessels rest here, some broken into skeletal remains, others remarkably intact. They are scattered across an underwater landscape shaped by currents and sediment, each a monument to a voyage ended too soon.

Globally, an estimated three million shipwrecks lie on the seafloor. Yet, for most, their location remains undisclosed, a closely guarded secret of the companies and national hydrographic offices that discover them. This information, often collected during commercial sonar surveys, is treated as proprietary data or a matter of national security. The rationale often cites protection from illicit salvage or safeguarding historical sites.

The consequence is a vast, hidden underwater archive. While a known wreck can be studied and its story told, an unpublicized wreck contributes little to our collective understanding of maritime history, engineering evolution, or even environmental impact.

This deliberate obscurity allows countless tales of human endeavor and tragedy to remain submerged, literally and figuratively. Broadening access to this geospatial data could transform oceanography, archaeology, and even our understanding of past climate patterns. The ocean holds history, but only if we collectively choose to illuminate it.

The Baltic Sea, with its low salinity and cold temperatures, is known for preserving wooden shipwrecks exceptionally well.