Ah, thank you!
The solution is actually much easier and less fiddly than I expected - very elegant!
Now I like this level very much.
The solution is actually much easier and less fiddly than I expected - very elegant!
Spoiler
I just should have thought more deeply about the possibilities of digging a big whole. I thought that it would be impossible to save the pack from being trapped when using a digger to block the return path to the left.