Double Braid: within the inner hollow such rope is formed.
A single braided rope (core), is surrounded by a hollow single braided yarn (skin). The result is a rope within another rope. Both the skin and the core share the load on the rope, but not in equal amounts.
Why is a braided rope stronger?
A twisted fibre or braided is stronger than the same bundle of fibres. They are stronger being straight because the cord has more capacity to stretch. It won’t stretch to the same length as the straight fibres. But in exchange, the fibres (and the spaces between them) can compress
