Poke it.
this vexes me
If it’s in the US … it’s probably Tylenol
Sewerage explosion imminent.
Or tree root growing into your kitchen
Really? Roots grow pretty slowly. You’d have a small perturbance, then a little bump, then an annoying bump. This is a “kitchen is almost unusable” level of floor displacement. And considering the rest of the room doesn’t look like it was ignored for 10 years…
This happened to me at my old condo. Apparently the original tiles had very little “adhesive” (or whatever you call that concrete mix to make them stick) so when one piece finally detached, it caused a chain reaction and lifted the surrounding tiles. I was in the bathroom and legit thought my living room was about to cave in the way it sounded. And this was at the 15th floor of a high rise.
