Fears to Fathom is an episodic indie horror series created by developer Rayll, with the first episode released in 2021 and built around supposedly true stories submitted by players. Each episode places you alone at home when ordinary notifications and sounds turn threatening. This short sting is closely tied to the in game phone alert, often listed separately as the Fears to Fathom Notification Sound. Clips spread on TikTok and YouTube horror edits, where creators reuse the chime as shorthand for a message you should not have received.