1: John Clarke in the small chamber just below the entrance to site 4184.
2: John Clarke emerging from the entrance to site 4184. (photos: Harry Long, 2015)
3: Harry Long in the small chamber just below the entrance to site 4184. (photo: Phil Ryder, 2015)
4: Phil Ryder in the entrance to site 4184. (photo: John Clarke, 2015)
5: The entrance to site 4184. (photo: John Clarke, 2018)