What lies beneath the Temple Mount in Jerusalem?

Other than the secret tunnels discovered beneath the Temple Mount in Jerusalem, some say that the Ark of the Covenant might have possibly been hidden underneath as well. Does anyone agree with this theory. I mean it makes sense, Solomon probably created some kind of lowering device for the Ark in case anything happened. Ever since the Babylonians raided the first Temple, the Ark dissapeared from history. Of course others say it rests in Ethiopia, but personally I think I'd rather stick with the Temple Mount as being the location of the Ark. Let me know your thoughts.