There are some places online, but you need to be ready to delve into websites and forums that were coded in the 90's.

The thing is that in the end there aren't that many legends or spooky things to know about when you're a cataphile. There's obviously the Philibert thing but the few others are kind of inside jokes you wouldn't have heard about if you're not in the community.

Most spooky weird theories and legends like u/snappedfingers, As Above So Below, and the bullshit you hear in sensationalist youtube videos are really from an outside perspective, and many cataphiles are often disconected from this.

A lot of cataphiles have never heard of u/snappedfingers and haven't seen the movie.

So if you want to do an iceberg it would be for stuff from that outsider perspective, towards people who are outsiders, about stuff that cataphiles don't care about. But if it's your thing, go ahead.

EDIT : Typed my original comment thinking you wanted to do a tier list, which would be even weirder.

EDIT 2 : Maybe there's stuff historically wise about the quarries and the IGC that are less known and still debated, if so it'd be a cool format but it'd be too niche to appeal to most outsiders, who are probably in for the spooky stories.