Unused Items *spoilers*

[Aphotic]

Any idea on the Iron Bar, though?

Yep.
Used in the prison in order to destroy the wall (alternate solution is to use the hammer and chipper).
You can also use it to get the key (alternate solution is to use the bucket of water).
I had the bucket of water at the end of my game as well as the wooden crank.

Lol, wow, I just broke the bar off and jumped on the table, and then through the hole in the wall. Okay, thanks guys.