[AFMUG] fiber conduit depth

[Adam Moffett]

So we buried a 3/4 PVC conduit about 8" deep for a drop cable.  Due to 
obstacles, that's as deep as it was realistically going to go.  Now 
somebody is wondering whether ice in the conduit is going to be a 
problem.  We're assuming in the long run water will always get in, but 
the question is whether it'll hurt the fiber when it freezes.

The person doing the wondering speculates that when the ice expands it 
will crush the cable and damage the fibers.  Is this actually possible?