Germany’s oceanographic research institutes successfully used Hydromea’s LUMA 250LP wireless nodes in depths down to over 4000m. The scientists of the Alfred Wegener Institute (AWI)/Max Planck Institute for Marine Microbiology (MPI) on board the research vessel Sonne were examining the possible environmental impact of deep sea mining of polymetallic nodules in the Clarion Clipperton Fracture Zone (CCZ) in the Eastern Pacific. By fitting their in-situ modules as well as the RO