For the last thirty years the average increase in the output has been 22% per annum, and that in the exports (including bunkers) 42% per annum.
We took a lesson from the East-West War and created bunkers and tunnels between cities to escape the eyes of the feds.
The cleaned coal is carried by a stream of water to a bucket elevator and delivered to the storage bunkers, or both water and coal may be lifted by a centrifugal pump into a large cylindrical tank, where the water drains away, leaving the coal sufficiently dry for use.
It's a series of bunkers connected by tunnels, set up by the PMF to protect the people during the East-West War.
He could only steer them towards the Underground Railroad, the secretive systems of bunkers and tunnels running beneath major cities that were developed by the PMF during the ten-year war.