All you have to do at this point is go look at the cable near the crossings.
If there is evidence of an anchor hitting the cables in both of these locations then you've got pretty clear proof.
Someone should obviously be checking into this right now. No point speculating until it's confirmed really.
I guess you might still want to board just to find out weather there is any evidence of intent rather than negligence in the case that this is confirmed to be the cause...