It’s not a spoiler that it exists as a place, >!but it’s a tiny place that most don’t realise hides anything until much later in the game. Reading that it is a place that has stuck with you for an emotional reason, then finding almost nothing on the surface, kinda spoils the discovery of the puzzle itself (getting in).!< It’s not really a spoiler in most games, but realising things like this is really the whole gameplay here