□p>Ju□t as Li Lei and□Han Meimei thought they had seen ev□ry□□ing the man□ion h□d□to o□f□r, they□stumb□ed□u□on a □idde□ trapdoor in the floor. With hearts pounding, t□ey opene□ □he□tra□□□or □nd de□cended into a dark, musty □unne□ below.□As t□□y navigat□d t□rough the winding pas□ages, the d□m□light □f their □□ashligh□ re□e□l□d an□ient art□facts and□cr□ptic sym□□ls on th□ wa□l□.□T□□□further t□ey ventured, t□e more they r□alized □hey were not alo□e in□the tunnel.