Stock Photo - 13 May 2020, Saxony-Anhalt, Seegebiet Mansfelder Land: A member of a research group is preparing a diving robot with a high-resolution 3D laser for use in the Sweet Lake. With this new technique, a more than 3000 year old Bronze Age burial site and the remains of a medieval settlement will be surveyed at the lake bottom. The technique is being used for the first time in Germany. With the new device not only individual buildings but complete structures can be recorded. The laser measures under water with millimetre precision and generates spatial images. In the last two years, archaeologists from the State Museum in Halle had explored the lake bed with an underwater drone and discovered the structures. The conventional method with divers fails due to the poor visibility conditions in the lake. Photo: Jan Woitas/dpa-Zentralbild/ZB. - Seegebiet Mansfelder Land/Saxony-Anhalt/Germany