deepdiver1972:They didn't run a line because permanent lines had already been run prior to the sinking.
There are no permanent lines run to the area where the divers were found. There aren't any cave lines from previous divers either. The hatch these divers descended into after just entering the wreck was origionally welded shut to prevent entry into that area. It was broken open after it's sinking.
The permanent lines you're refering to are 1" polypro lines that run through some portions of the wreck. Every compartment these lines run through have a visible egress to open water and none are placed below the main deck of the ship.