Everything in this thread and everything in these pictures ranging from layout textures and models are subject to change and do not reflect the final product!
A boring bland wall stands before us, lets sex it up some.

First need to remove all non essential entities so we can get a clear shot of the wall.

This seems like a good area for the cave in to happen.

We start off with a basic shape we want for the rock slide/cave in before it gets turned into a displacment.

We need to shape it up a bit, few tweeks and in game tests.
Next some debris from the wall is added in as well as turning the support beam into a displacment and twisting her up a bit. Popped in our broken rail models, yes they have a use now! And shaped the cave in around the props and geometry.
Thus we end up with this, a few more tweeks here and there (more broken wall around hole) and we will be good!
<3