Stock Photo - 13 May 2020, Saxony-Anhalt, Seegebiet Mansfelder Land: Members of a research group are mounting a high-resolution 3D laser on a diving robot for use in the Sweet Lake. With this new technique, a more than 3000 year old Bronze Age tomb and the remains of a medieval settlement are being 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