Well it all depends.
If you are lucky, there is a spare wire not tie wrapped you could use to pull it.
If not, then look for an existing wire or cable that is not tie wrapped in the hull. Use it to pull 2 wires in thru the hull leave one and use the other to pull the new line plus the existing line back thru.
If they are tie wrapped in the hull. The it's a matter of trying to snake a fish tape thru. If this is the case you probably need 2 people one on each end. Have the other person move the cables around to help make room for the fish tape to go thru.
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