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The rope... each "rope" made of steel was comprised of 200 threads of steel. This is the type you use when you're stringing heavy objects to buildings, etc. The harness had at least 5 different points of failure with some redundancy. The zip line harness had two points, with two carabeeners available too. The platform in the trees had redundancy too...It keeps going on and on. A seemingly unsafe ride was probably more safer than walking across a street.
A good lesson from this is that we should take our single points of failure and make sure we fortify them or make them redundant in the systems we build and support. The feeling of being secure made the overall experience quite enjoyable. The fact that it was secure was not the most exciting part, the part where I was going around 120 km/h at around 500-1000 feet off the ground was the enjoyable part. I highly suggest shelling out the money if you want a great ride.
PS: That's a picture of me on the zipline.