Today, the library--one of the largest television collections in history--is stored 54 stories underground in a climate-controlled salt mine near Kansas City, Kan.

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The rig that drilled the successful shaft was supplied by a contractor at Collahuasi, a mine controlled by two multinationals, Anglo American and Xstrata.

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The team hopes the laser could be built into a remote-controlled robotic device which could be despatched into a mine field, looking for vapour clouds.

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The Alpha chain will be controlled from a joint control center, with teams from the mine, railroad and port sitting in a single place to optimize results.

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