This experience was a break neck tour of subterranean kiev. Our guide (Max?) passionate, funny and well informed about the underground drainage tunnels of Kiev and the usage and protocols of the old Civil Defense Nuclear bunkers. We never felt unsafe and the provided gear meant we were only slightly dirty coming out! People over 6ft might struggle with the shorter ceiling passages that require you to bend over significantly. All in all, a great and informative tour in a challenging location!