Show collier es under the sea at cape breton there are immense J ca coll erles being worked under the ocean these submarine mines cover over 7 a thousand acres and are being in creased steadily the r ines are en at the shore and the operators follow the vein beneath the water for more than a mile it might be ex pecked that the weight of the water would force its way into the mine the bed of the ocean is as tight as a cement cistern A sort of fireclay lines the submarine root roof of the mine t and the sediment above is held in 1 place and packed down by the water i pressure until there is not a crevice nor a drop ot of water from overhead |