What is this metal cable in wall?
So, based on the fact that this cable is dead straight I assumed it to be structural - it's clearly under tension to be that straight. Visually, it appears to be galvanized steel, not something electrical, and electrical is not normally tight.
Tie down made sense. Noting a username implying a Florida location, tie down made a LOT of sense. Keeping your frame attached to the foundation helps immensely in hurricane and tornado survivability.
Brief web search for &quot;structural cable tie slab&quot; found what appears to be at least one company making such things. Obviously I'm not associated, and I don't know if there are others.