The Bohan Tunnel is a straight subway tunnel coming out in the Bohan district. It's the only Subway tunnel in Bohan and is subject to Ratman sightings.
The nature of the Ratman sightings in this area doesn't include any physical contact with the Ratman. Players have only heard footsteps and seen shadows of the Ratman in the area. It is said that Ratman hides in the dark shadows of this tunnel. However, the tunnel is heavily isolated and doesn't include any workers or homeless civilians, and is only used as a train passage.