Sea survey and its impact on maritime archaeological research in the Baltic Sea during the last 30 years

More than 70 percent of Earth’s surface is covered by water, a surface that is gigantic to map. Through the technical development in hydrographic surveys, we have today a completely different understanding of the seabed’s topography and geology than we had just a few decades ago. This has also meant that we find more and more shipwrecks, but also sunken landscapes and other remnants of human activity. This article is a summary of this development