Wire Cable Bolted Under Cab, Wrapped Around Mid Cross Member?

[Basilius]

I recently removed the bed to refurbish the frame of my vehicle, and I noticed a thick steel wire cable that is bolted to the under side of the cab and wrapped around the mid-frame cross member. I also must have disconnected one end of the cable at some point but I can't remember when I did that. Does anyone know what this cable is and what it's used for, and also how the other end reconnects? Thanks

 

[pjtoledo]

those are seat belt anchor bolts the cable is attached to.
the other end of the cable attaches to the missing bolt in the cage-looking thingie.
I'm not sure if they give added strength to the floor, or are intended to cut you in half if the body separates from the frame in a collision.

 

[Basilius]

Thank you very much, that must be correct. Someone else said that the cable is there just in case the floor pan should rot/rust out which wouldn't hold seat belts in a crash, and the strap (wrapped around the cross member) would then be holding down the seat belts. I recently took out the driver seat and removed a seat belt bolt, so that must be why the other side of the cable disconnected.