Can't get into the base hangar (SPOILERS) (Metal Gear Solid 5: The Phantom Pain)

Such a problem. It seems like my tank began to be developed and in the hangar at the base I can control it. But I can't find the hangar. That is, the orange square is on, I am running and cannot get into it. I found only a type of hole, a deep arch and that's it. Tell the blind man ...