Washington. New analysis of satellite images has shown that construction activities have intensified this year at an underground facility suspected of being related to Iran's nuclear program.Analysts at the Center for Strategic and International Studies (CSIS), a US think tank, have stated that construction activities at Pickaxe Mountain have seen a 'clear increase' this year, based on satellite images from the past six years.This structure, located about 140 miles south of the Natanz nuclear complex, is being built deep inside a granite mountain. US and Israeli intelligence agencies have long viewed this as a potential location for Iran to secure...