The Extreme Energy Events (EEE) Project, mainly based on a network of cosmic ray telescopes, consisting of MRPC gaseous detectors built by high school students at CERN and taking data for more than 15 years, has recently employed additional scintillation detectors for several measurement campaigns and long-term investigations of secondary cosmic rays over a large range of northern latitudes. Muon rate measurements at the sea level were first performed by the PolarquEEEst expedition on a sailboat from 66° to 82° N, and extended in a subsequent expedition by car, covering an overall latitude range from 35° to 82°N. Since 2019, three additional detectors, similar to those used in these expeditions, were permanently installed at Ny-\r{A}lesund (79°N, Svalbard islands). Besides the prolonged monitoring of cosmic ray activity at such northern latitudes, these devices were also able to record the Rayleigh-Lamb waves generated by the 2022 Hunga-Tonga volcanic eruption. Results from the last three years of data taking will be presented and discussed.