The video is very self explanatory if you check the description..
I fell under the map on the Reef, and survived, didn't understand why so i kept trying to replicate it and have since found a way to do it all the time!
I just found this interesting, wonder if anyone else has found it before? Most likely, aha, but anyway a pretty cool glitch, nothing to it, just thought i'd show you guys!
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All you have to do is jump in a corner and go all the way down without hitting anything else. It would be easier to see it in a video instead of typing out the instructions to do it. But other have posted this and have shown how to do it