corruption

Hi. I am experiencing pretty major corruption on a large-ish ZFS pool. And am wondering if anybody has seen similar or has some tips to aid recovery. I have rolling snapshots setup using zfsnap. But I only have backups of my most critical data from this pool. I'm running FreeBSD 12.2-RELEASE...

I'm just guessing now but I probably had an issue with my main storage machine, probably a faulty power supply. The issue is that it rebooted multiple times despite connected to UPS. I believe my pool got corrupted, and the machine just constantly rebooted, tried to import/mount then panic, then...