From the data on Cherenkov light from EASs collected over the period of more than 15 years, the spectrum of cosmic rays was obtained in the energy range 1015− 1018 eV. This spectrum has two features: at ∼ 3× 1015 eV (first knee) and at ∼ 1017 eV (second knee). The first knee is characterized by the indexes γ1 = 2.7±0.03 and γ2 = 3.12±0.03 and the second knee — by γ1 = 2.92±0.03 and γ2 = 3.24±0.04. In the second case the difference amounts to ∆γ23 = 0.32± 0.03± 0.05 which is less than the case of the first knee ∆γ12 = 0.42± 0.03± 0.05 (here dual errors represent statistics and systematics correspondingly). The lesser difference ∆γ23 can be explained with the influx of cosmic rays from Meta-galaxy and, hence, with some increase of the cosmic rays intensity in the energy range 5×1016−1018 eV, which compensates the escape of heavier nuclei from the Galaxy. The presence of the second knee could be confirmed by abrupt change in mass composition from from 〈lnA〉 ∼ 3 at ∼ 1017 eV to 〈lnA〉 ∼ 1.5 at 1018 eV found from the analysis of longitudinal development