Is there a way on Big Sur to access the topmost physical disk of an APFS drive? 

I have a 1TB external LaCie APFS-formatted USB SSD drive. 

When I mount the drive on a pre-APFS Sierra 10.12 system, I can see the 
protected APFS "Container" folder, which I can't enter into (which is 
expected). But it does allow me to copy files onto what I assume is the topmost 
"physical disk".

However, when bringing the drive over to a Big Sur 11.4 system, I can't find 
those files anywhere. 

Using diskutil it appears the topmost "physical disk" would be disk2, but it 
doesn't show up as mounted. Is there a way to access it?

% ls -la /dev/disk2
brw-r-----  1 root  operator    1,  11 Oct 28 11:15 /dev/disk2

% df -h
Filesystem       Size   Used  Avail Capacity iused      ifree %iused  Mounted on
/dev/disk1s5s1  894Gi   14Gi  525Gi     3%  553757 9373995203    0%   /
devfs           202Ki  202Ki    0Bi   100%     699          0  100%   /dev
/dev/disk1s4    894Gi  7.0Gi  525Gi     2%       7 9374548953    0%   
/System/Volumes/VM
/dev/disk1s2    894Gi  271Mi  525Gi     1%     772 9374548188    0%   
/System/Volumes/Preboot
/dev/disk1s6    894Gi  408Ki  525Gi     1%      16 9374548944    0%   
/System/Volumes/Update
/dev/disk1s1    894Gi  347Gi  525Gi    40% 2583753 9371965207    0%   
/System/Volumes/Data
map auto_home     0Bi    0Bi    0Bi   100%       0          0  100%   
/System/Volumes/Data/home
/dev/disk3s1    931Gi   14Gi  596Gi     3%  553757 9765023683    0%   
/Volumes/LaCieBackups
/dev/disk3s5    931Gi  274Gi  596Gi    32% 2483976 9763093464    0%   
/Volumes/LaCieBackups - Data

% diskutil list
/dev/disk2 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.0 TB     disk2
   1:                        EFI ⁨EFI⁩                     209.7 MB   disk2s1
   2:                 Apple_APFS ⁨Container disk3⁩         1000.0 GB  disk2s2

/dev/disk3 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +1000.0 GB  disk3
                                 Physical Store disk2s2
   1:                APFS Volume ⁨LaCieBackups⁩            15.3 GB    disk3s1
   2:                APFS Volume ⁨Preboot⁩                 283.7 MB   disk3s2
   3:                APFS Volume ⁨Recovery⁩                620.0 MB   disk3s3
   4:                APFS Volume ⁨VM⁩                      1.1 GB     disk3s4
   5:                APFS Volume ⁨LaCieBackups - Data⁩     293.8 GB   disk3s5


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