The underground sections of McKinley Bunker were quite extensive. There were several passages, not all of which I could or wanted to get into. The bunker has double walls with gaps between them to adsorb shock from bombs. It is also unusual in being a multilevel bunker, with rooms and passages on more than one level.

Entrance way to McKinley Bunker

The view from up top showing the removed bar that allowed me access to the tunnels

Tunnel passages

Grille in the tunnel

To the munitions room

Lots of graffiti scratched into black mold growing on the walls and ceiling in the munitions vault

Warning from past explorers with a sense of humor

The bottom of the munitions lift up to the gun emplacement above

Detail of ceiling vent

Narrow passage between munitions rooms

Stairs to the lower level

Looking back up the stairs. The main entrance is to the left at the top of these stairs

The really long passage tunnel which had water flowing through it

Passageway to the lower gun emplacement

Lower level rooms were in much better condition

Locked door to the lower gun position

The lower gun emplacement was all overgrown

View from above

Lower gun emplacement, observation post and marine light.