Deep within the drab concrete headquarters of thecult Aum Shinri Kyo, Japanese police today discovered a hidden chemical lab and a storeroom filled with the ingredients for nerve gas. The cult is the chief suspect in last week's nerve gas attack on the Tokyo subway system that killed 10 and injured thousands, with hundreds still hospitalized. In another cult building, police found underground rooms that they believed were used to imprison people who tried to flee the sect. Police found millions of dollars worth of yen, piles of gold bars and tons of chemicals in cult buildings, including theingredients of sarin-- the nerve gas used in the Tokyo attack -- as well as glycerin compounds that could be used to make explosives. The leader of the group, Shoko Asahara, remains at large although he has broadcast messages denying responsibility for the subway attack.