Moonglow Cavern
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The Moonbeam Cave is an underground cavern on Rougetsu Island. It is situated below Haibara Hospital. The cavern was used in the rituals of the island; it contains a shrine, and a grand door connects it to the Rougetsu Tunnels.
The name of this cave is related to the natural illumination coming in through the well on the grounds of Haibara Hospital, known as the Moonbeam Well. During the full moon, the well was said to fill up with light, and become a reservoir for the spirits.[1] Those who had lost their memories entirely and become empty shells were sent to the Moon Reflection Well to bask in the moonlight, but although this treatment stabilised their condition, [2] it was not expected to restore their memories or sense of self.
After the Kiraigou failed in 1970, the five girls who had been performing as Kanade were brought to the Moon Reflection Well, where their condition was observed closely by Shigeto Haibara. A doctor at the hospital, Shouji Katagiri, heard their voices from underground and tipped off the police, and the girls were discovered by Choushiro Kirishima two weeks after their initial disappearance.
During Fatal Frame IV, both Ruka and Misaki have fragmented memories of their time in the Moon Reflection Well, and Ruka reacts particularly strongly upon her return, saying she feels as though she's been there forever. Choushiro also has several flashbacks to the moment when he discovered the girls and thought he saw their faces change. This series of flashbacks culminates in Chapter 10, when he finds Ruka in the cavern and gives her a piece of the mask.