The 1 Chase Manhattan Plaza vault is just across the street from the NY US Fed gold vault and at the same depth. It is assumed the two are linked by a tunnel as in the past a lot of foreign national gold held in the Chase vault was booked or transferred to the US to settle debts before we went off the gold standard [our US once was a creditor nation, rather than debtor].
If the tunnel exists, China could demand payment of all the US debt it holds in gold and this transfer would occur without we citizens being the wiser. Of course, that would only occur if a disloyal weasel was in the White House so do not worry.
Oh great... that's just great...