Classic creepypasta. It’s this one, the search and rescue stories, and I think there’s another that slips my mind right now.

EDIT: boy did I miss a few.

• Ben Drowned
• Candle Cove
• Russian Sleep Experiment
• Squidward’s Suicide

Of course, some of the weaker ones imo are also classics:

• slender man
• jeff
• the backrooms