Sanctuary of Athena. (Immortals: Fenyx Rising)

Hello everyone! In the sanctuary of Athena there are two dungeons, "Dungeon of Athena", in which we find ourselves in the story, and another one nearby. So my question is, how to get into this dungeon? 500 times he walked around the whole building in a circle, climbed the nearest surroundings, but never found a way to get inside. Maybe someone knows how to get there?