Unidentified object ... at the bottom
Baltic Sea - still unrecognized with unidentified objects at the bottom. Strange elevations and depressions at the bottom… What can be hidden under a layer of gravel and sand of the sea? This question can answer Multi-beam sonar for hydrographic measurements, the latest arrival of Navigator XXI. Echo sounder with equipment represents the latest research position to build a prototype of a multi-layered electronic map of marine areas.