Continued digging and broke through the boulder choke at −500 m in the Nekujbyshevskaja Branch, explored it to the next boulder choke at −640 m.* October: the Ukr.S.A.
Continued digging and broke through the boulder choke at −500 m in the Nekuybyshevskaya Branch, explored it to the next boulder choke at −640 m.* October: the Ukr.S.A.