A very well hidden subway entrance, it's guarded at all time by a dozen ANBU. Only those who are a part of the branch can get past the entrance to the subway itself. Any who are not of the branch are vigorously turned away, with force if need be. The entrance, being outside of the village, requires all to leave in order to enter, paradoxically. A subtle reminder that the ANBU Branch operates outside of Konoha itself, nowadays. Inside the tunnel are dozens of series of tracks, all of which lead to dead ends after going through miles of tunnels. All but two, rather. These are the tracks to, and from, the new ANBU HQ. Wind-powered carts traverse these rails to get back home.