There is a YouTube video by a young guy in Australia or NZ who demonstrates how to "splice" synthetic winch rope. The rope is hollow so he pushes one broke end into the the other broke end about 12 ft. or so and then stitches both ends together.
As the rope is tightened down they lock together.
When I was a child there was a toy called "finger cuff" or something, made in Japan (1950's) of woven straw -like material.
You put one finger in one end, and one finger from your other hand in the other end. As you tried to pull your fingers apart the woven tube would tighten down and lock your fingers together.
Anyhow, that's the same principal as the synthetic winch rope splice.