“So. Sitrep," Tony said aloud, mainly to keep himself sane. "I'm stuck in a cave with no way to communicate to the outside world that I'm alive, and there's at least a couple of hundred feet of rock between me and help. The way I came in is definitely blocked, and I'm sporting the most spectacular compound fracture which will no doubt make moving around a bit – interesting. Plan of action... Trying to get out on my own might be a challenge.”
Or, cave rescue, Avengers style. Takes place at some non-specific point in time after Iron Man 3 and before Age of Ultron. Established Steve/Tony, though it's mostly in the background.
