Breath of the Wild Getting into a room in the Hyrule Castle

[Excaliver]

I finished the game and Have been enjoying the Hyrule Castle and it's secrets. But I have stumble into a room in which looks impossible to get into.Its beside the first guard house and is not the one you use cryonsis in. But another one beside a dead tree. I would appreciate any help. Thank you

 

[Azure Sage]

Is it possible for you to upload pictures of this place? I know Hyrule Castle pretty well but I'm not sure where you're referring to.

 

[Fraxinus]

i want to think thats the guard barracks or something? The gate doesnt open from the outside, I think theres a lever or switch you have to hit from the inside of the room. I dont remember how to get into that room from the interior offhand, though.