Encourage the reviewee to do most of the talking.

The Russian Mafia did not take too kindly to a Westerner muscling in on their market, and so decided to send a little message.

Chocolate rocks.

We arrived at level 15 where we piled into a battery powered tramcar for a ten minute ride to the section of the mine we would be visiting. Packed into the tram we realized why the gigantic cooling and ventilation systems on the surface pumps 550 cubic meters of air into the mine each second.