Student or Learner
Have you ever come across a phrase "dead-end wall".
A certain guy was in a mine. He didn't see anything cause it was dark.
He put out his arms again, trying to gauge the width of the shaft here. He touched what he believed was the dead-end wall, but nothing was on the other side. He kept moving to that side, but nothing was there.
I have not heard "dead-end wall" but the meaning seems clear.
A “dead-end” is an end of a street or passage, where you can go no further and must turn back. So the “dead-end wall” would be the wall at the end of the passage.