  A new project is developed with the implementation of a relatively new method
of studying the primary cosmic ray -- the registration of extensive air
showers' optical Vavilov-Cherenkov radiation (Cherenkov light) reflected from
the snow surface. The aim of the project is the study of the cosmic ray mass
composition in the energy range of 1-100 PeV by detecting the reflected
extensive air showers' Cherenkov light. Silicon photomultipliers are planned to
be used as the main photosensitive element of the detector and an unmanned
aerial vehicle will is planned to lift the measuring equipment over the
snow-covered ground.
