Stock Photo - ***JUNE 24, 1965, FILE PHOTO*** The test operation of a new underground gas storage tank - the first in the Czechoslovakia - started these days in Lobodice near Prerov. The gas is injected by probes into the porous rock to a depth of 350-450 m under a pressure of 50-60 atmospheres. The underground reservoir, which can hold up to 300 million m3 of gas, will allow excess coke oven and artificially induced gas to be stored in summer and then pumped back into the grid in winter. Pictured here, Vlasta Rihoskova adjusts the operation of the gas boiler for steam generation to regenerate activated carbon for the high-pressure gas treatment plant. (CTK Photo/Frantisek Nesvadba)