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