Nice job to Geoffster for these levels/pack and thank you again to namida for converting it to modern NL!
Unfortunately, I have backrouted this level to hell and back, it would seem
Maybe you'll have more luck getting the intended solution
Thanks for playing my levels and the nice compliments!
Also kind of serves as a hint to the level solution where the 2 Lemmings must help one another in order for them both to make it to an exit
"Dune" and "you" sort of rhyme too, and the reason for dune in the title is it references the graphic set I used to make the level, which is Icho's Dune set, which in turn is based on the Dune 2000 game. I don't know anything about the game myself, though 
Yes, it does cut it very close to being splat height, but it should always be safe when mining to release the entrance trapped in by the thin steel.
Again, as I've stated in the OP of the in-development pack topic, I don't expect Lemmings Memories to be the next NepsterLems or Lemmings Reunion in terms of difficulty, though maybe it's already up there in the difficulty with them?
We shall see, won't we? 