Interne Festplatte verschwunden nach GreenScreenOfDeath

I was working on my Surface Pro 2017 Windows 10 Pro 64bit lates - per June 15th 2020 - Insider Preview as I suddenly was confronted with a GreenScreenOfDeath after which my device would not boot back into Win10 but only into UEFI BIOS.

So I tried to refresh the system via a USB Boot-Stick but that didn't let me refresh the system.

So I went into the command line to see what I could rescue from the internal drive before going for a fresh install, but much to my surprise there was no internal drive.

Consequently I just wanted to see what happens when I start a fresh install which revealed that the internal drive seems to have lost the partition info as it reports 238.5GB of unassigned space on my internal drive.

This leads me to believe that my data should still be there if I only had a way to recover the partition.

A few years back there seems to have been a similar issue where tools like EzUse could recover the system drive on "normal" PCs as one could easily boot into a temporary Windows installation to run EzUse on the previous system drive, but with a Surface this doesn's appear to be that easy.