More proof gathered

Then, Mikhail stumbled upon a mining quarry with abandoned equipment as well. This was proof that the Russians mined for precious minerals and natural resources. The tools and machinery strewn told them how the men back then worked to get money to fund the army.

Further proof of their theory

Mikhail and the men with him theorized how the mine was left abandoned, but with the pieces of evidence they found, they couldn’t immediately jump to conclusions. That is, until they came upon big machines that were left in mid use. This cemented what they had believed earlier, but being 1,500 deep into the mines there was nothing they could do, even if their lives could be in peril. They could only press on and further investigate.