Three to one bend - is there such a thing?

Question comes from something I saw on the telly.

A guy in the jungle of Guatemala built a triangular sleeping platform from branches and vines. Apparently he wanted to be out of reach of jaguars, though I hear volvo drivers are more dangerous to people on foot.

He holds up the ends coming from each corner above his head, so they must have been about 8ft long, and explains that he just needs to join them to a vine thrown over a branch. “I wonder how he’s going to do that,” I asked myself, but I was not to be enlightened because it then cut to him after dusk, hauling up his platform in silhouette.

The vine must have been strong and flexible, perhaps enough to make a loop. Not sure though I would like that degree of point loading on vines. I was sort of hoping there was a super-duper multi-strand bend I didn’t know about.

If limited to common knots I’d probably go for a triple sheet bend - least twisting of the vine and under continuous load it should hold.