The first instruments  arrived at the low base (ski resort level) on 23-24 September 2021. They included the AIAS mobile depolarization lidar (NTUA, Greece), the HALO wind 3D scanning lidar (FMI, Finland) and the CIMEL sun photometer (LOA, France). In the folloing couple of days the HALO and AIAS started taking measurements. Next step is to align the CIMEL to the sun.