Explored the section beyond the Kvitochka Sump to a further sump called Dva Kapitana ("Two Captains") at −2,140 m.* August: the Ukr.S.A.
Explored the section beyond the Kvitochka Sump to a further sump called Dva Kapitana ("Two Captains") at −2,140 m.* August: the Ukr.S.A.