Ok so I just spotted this hole and unfortunately I do not have a link but I can describe where it is easily. The jumping puzzle has either the straight ahead method, or go to the left in that cave that also starts another puzzle that will lead you to the platform for the atheon room. I went in and did a little bit of exploring while we had some AFKers and went to the left path.
I looked straight down where there is another platform seemingly in a auto kill or no no zone. I landed and looked around and there is a hole in a wall that resembles the Templar secret chest hole. That tiny, gotta crouch to get in hole that just is hard as hell to see.. has anyone else found it? The room has purple crystals in it and is fairly shallow in depth but it has got to have a purpose.. they wouldn't just put a hole like that in the middle of nowhere for no reason... right??
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I have been there too, and maybe there is another chest through the Vex portal u can see from that platform. If you think about it, after killing Atheon you don't go to orbit, maybe that's because there's a chest that appears when you finish. And when you are in orbit, after completing the hole ride with all chests and you select VoG, there's still bounties to discover. So it's not completed yet. Just my opinion.