Just as Li Lei and□Han Meimei tho□ght they□had seen□everythi□g the m□□□□o□ ha□ to of□er, t□ey stumbl□d□upo□ a hidden tra□door in t□e f□oor□ With he□rts□□o□nding,□they opened the □□apdoor and des□e□ded□□nt□ a□dark, must□ tunnel be□ow. A□ they □av□gated □hrough t□e winding □assages, the di□ □igh□ □f their□flashlight □e□ealed a□cient □rtif□cts and □rypti□ sy□bols o□□the walls. □he□fu□the□ they□v□ntu□ed, the mo□□ th□y r□alized the□ were not alone in the tunnel.