This is a photogrammetry of the remains of the Kannonzaki Battery No. 3 in Yokosuka City, Japan. The site of a gun battery and the brick tunnel remain in Kannonzaki Park. Two howitzers were installed in the mortar-shaped turret.
I attached a 20mm prime lens and a clip-on flash to a Sony A1 on a tripod and took 650 photos. The photos were taken on a lightly cloudy day, and the tunnel lighting and de-lighting the outside of the tunnel was done using flash light.