A perfectly-preserved wreck that has lain unnoticed in the icy waters of the Baltic Sea, between Sweden and Estonia, for over 500 years, has finally been discovered. The European vessel was first detected in 2009, when a sonar survey by the Swedish Maritime Administration indicated a large object in the area. However, it was not until early 2019 that maritime archeologists from the University of Southampton in England and Sweden-based marine survey specialists MMT found evidence of the sunken ship using underwater robotic cameras.