A while back I was commissioned to forge some knives from cable recovered from a decommissioned aircraft carrier that was being scrapped.  The cable was 1/2" in diameter and once forged into a square bar it was folded back on itself.  The first test knife didn't go so well, cable suffers from decarbonization at weld up anyway and that is magnified from small wires.  The cable itself seemed lower in carbon than standard extra IPS and the first test knife wouldn't harden enough for a knife.  

It was decided to forge a Go Mai billet (5 layers) to make a knife that would be usable but still carry that steel cable.  With the cable I was sent 7 more blade were forged and handles of various styles were applied.  

The gentleman who commissioned these is giving them to friends who served on the ship with him.