Although in theory the location of U.N.C.L.E.'s New York headquarters is supposed to be secret, the very first episode of the series, "The Vulcan Affair", demonstrated that it was a poorly-kept secret, at best, as the very teaser of that episode shows THRUSH operatives infiltrating U.N.C.L.E. headquarters through Del Floria's entrance in an attempt to mount an armed assault and kill U.N.C.L.E.'s Section One, Number 1, Mr. Waverly. Other episodes showing THRUSH's knowledge of the location of U.N.C.L.E. headquarters include "The Deadly Games Affair", "The Deadly Decoy Affair" and "The Mad Mad Tea Party Affair" (all first-season episodes). In "The Deadly Decoy Affair", the Del Floria entrance is even used for egress during a high-profile prisoner transfer during daylight hours. Although, as noted in "The Double Affair" and other episodes, THRUSH has a very effective intelligence service and has also, as demonstrated in "The Mad, Mad Tea Party Affair" successfully corrupted U.N.C.L.E. personnel, or infiltrated their own as moles.