If you're lucky, a hard drive will fail incrementally, and you'll get an odd crash beforehand as a warning.
But in general I've seen more machines "just fail" than give a warning. Which (broken record) is just the way of things.
All may not be lost for the OP. But they will need to locate someone who is able and willing to run with some diagnostics to maybe remount and recover the data.
One of my "inventions you'll never see" a few years ago at one of these corporate brainstorming jollies events was a USB dongle you plugged into a machine that booted it up and then allowed incoming connections from a repair shop. Came second to a solar powered whoopee cushion.
However these days you may not need that. If you can download and burn a LiveCD image of one of the various recovery distros of Linux, you can fire up a browser and then use RTC to connect to a friend who might be able to help.
The OP doesn't say if theirs is a spinning rust HDD or SSD. I wouldn't expect an SSD to fail this far in.
My best laptop expiry event was a lightening strike. No idea where it hit nearby, but the motherboard was fried.