Construction of the Baikal-Amur Mainline; tracklayers works.
Baikal: taiga, mountain ranges and Udokan Kodar.
Udokan copper near the Char Valley.
Search parties Udokan geological expedition.
Geologists examine rock samples.
Drilling works for soil research.
A sample of the copper ore.
Hydrologists examine water rivers, hot springs, ice water.
Hydraulic station works; enters the groundwater.
Geologists who discovered underground sea; geologist girl dancing under running water.
Key words
Trains.
Extractive industry.
Nature.
Geology.