I used to always say this about quicksand, it's in like every third young adult or fantasy novel but like lol who ever deals with that nowadays
and then when I was working as an entomologist I did actually get caught in fucking quicksand while working a greenbelt and I was suddenly really grateful for all those stories modeling how to deal with quicksand
Quicksand is actually pretty slow, and I was able to get my phone from my pockets before my legs went under, and I was microfamous at the time so I fucking live tweeted the experience ajfjfklals
I was walking along the creek bed bc the tide was super low looking at all the various detritus and creek bed stuff that's usually not visible and didn't notice I was crossing the mouth of a marsh which is exactly the place to find quicksand. Thought "oh it's getting a little too squishy" and then the next step I went SHLOMPF and was in the ground right up to my knees.
Didn't seem like anyone could hear me so I flopped on my back and wriggled out, lost one of my cheap slip on shoes and got very muddy but otherwise safe.