Essentially, the rocket is packed inside a canister which is loaded into a silo.
At launch, a black powder charge underneath the vehicle produces rapidly expanding gases that pop the Dnepr up out of the ground like a champagne cork.
There is then this heart-stopping moment when the vehicle just hangs 20m above the ground before the first-stage motors kick in and the former war machine climbs skyward.
http://www.bbc.co.uk/blogs/thereporters/jonathanamos/2010/03/riding-the-strangest-rocket-in.shtml via Knirirr's Wafflings | YouTube Video of a Dnepr Launch | Image: BBC