[2020] I found a small secret room on manning national zoo that you can't enter

So i found it in the big area were you can also fight the secret boss The Agony. In the big open enclosure is a big rock formation but you cant see anything bc its dark, but after i shoot randomly all monkeys i saw it turned a light on in the hole see here i didn't find anything about it maybe it just a easteregg or maybe it has more meaning behind I try my best to find anythinng about it if i find something i will update this post.

Edit 1: I found out that you can go inside with the photo mode here is a closer shot https://imgur.com/HpyvIG2 and the wolf shadow was produced by a small wolf scupture with a small light infront of it i forgot to take a picture of that :c and can maybe someone identefy The sniper rifle?

Edit 2: Ok some nice Reddit people told me that its an easteregg froam Metelgear solid wich goes same to the Boss The Agony nad it has no more behind it