And down in the caves below jerusalem we consider another possibility. the ark never left but was instead hidden away in this underground labyrinth. >> so you think it remained in jerusalem. >> yes. we know from the bible another thing. one of the kings put it somewhere in the tunnels. >> a tunnel like this? >> nobody knows. >> is there any evidence of this -- >> no evidence. no evidence at all. only many stories around. >> reporter: if only these walls could speak. they do, however, appear almost to weep. and their tears are said to tell a powerful story about the destruction of jerusalem. >>...