Underground Limestone mine subsided. 
There will be many metaphors.
The field being covered in astroturf is also really on the nose, fake plastic grass where people play while under the surface the collapse is waiting.
wack CCTV footage in there.
growing up in FL, where the sinkholes are not due to mines, but natural processes, I had assumed all sinkhole formed from natural processes and this made them scary. void collapses rapidly underneath your house: adios!
but I guess dumbasses will build shit on top of extractive mines and be like "omg wha-happen" when that ends up doing the most obvious thing I the world.
I mean unless its really shallow building over mines is kind of inevitable and not unreasonable. But limestone mines specifically.... well limestone dissolves in water, so any change in drainage could undermine you and make the ground unstable I would think.
Breadtube if it didn't suck.
Post videos you genuinely enjoy and want to share, duh. Celebrate the diversity of interests shared by chapochatters by posting a deep dive into Venetian kelp farming, I dunno. Also media criticism, bite-sized versions of left-wing theory, all the stuff you expected. But I am curious about that kelp farming thing now that you mentioned it.
Low effort / spam videos might be removed, especially weeb content.
There is a cytube that you can paste videos into and watch with whoever happens to be around. It's open submission unless there's something important to commandeer it with at the time.
A weekly watch party happens every Saturday (Sunday down under), with video nominations Saturday-Monday, voting Monday-Thursday. See the pin for whatever stage it's currently in.