If you need to perform a data recovery from an external ZFS [zfs] volume you may find those hinds helpful:

1. Attach encrypted partition where ZFS pool resides with:

   geli attach /dev/your_device_partition

2. Import ZFS pool at given mountpoint (/mnt/zfs):

   zpool import -af -R /mnt/zfs

Modify mount point location for a given dataset that may have mountpoint set to none what marks it as no mount (note this mountpoint will append to parent mount point location):

zfs set mountpoint=ROOT zroot/ROOT/default

3. Mount and mount all pool datasets:

   zfs mount -a
   zfs umount -a

4. Mount/umount given dataset:

   zfs mount zroot/ROOT/default

5. You can verify if your ZFS pool is active with:

   zpool status

6. You can see what ZFS datasets are available with mount points with:

   zfs list

[zfs] https://www.freebsd.org/doc/handbook/zfs.html