X--未知的元素

British Army radiation drills at a remote Scottish base attract a subterranean,radioactive entity of unknown nature that vanishes,leaving two severely radiation-burned soldiers... and a bottomless crack in the earth. Others who meet the thing in the night suffer likewise,and with increasing severity; it seems to be able to absorb radiation from any source,growing bigger and bigger. What is it How do you destroy a thing that feeds on energy