It is not a site where much story takes place in the series. Any travel between Bilibin and Imil would take place through here. The group led by Saturos and Menardi come through here on their way to Imil, to activate the Mercury Lighthouse's beacon, and the group consisting of Isaac, Garet, and Ivan travel through the cave in pursuit of them shortly afterward. Mercury Lighthouse is eventually activated. Shortly afterward, Saturos' group travels back through the cave to return to the rest of Angara and continue towards their next destination, Venus Lighthouse. Isaac's group does the same, with one more in their group: Mia, from Imil.