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Show I Collieries Under the Sea. At Cupo Hreton there arc lmiiu'liso collorloB being worked under the ocean. Thcso submnrlno mines cover u thousand acres, nnd nro being increased in-creased steudlly. Tho mines nro entered en-tered nt tho shoro. and the operators follow tho vein beneath the water for moro than a mile. It might bo expected ex-pected that tho weight of tho water would forco Its way Into tho mine. Tho bed of tho ocean Is as tight us u coment cistern. A sort of llrecluy linos tho submnrlno roof of tho mine, mid tho sediment above is held In placo and packed down by tho water prossuro until thoro is not a novice nor a drop of water from overhead. |