Indoors, but doing what? Scotty was manning some sort of a workstation, equipped with generic devices dedicated to processing information. What was he doing if not paying attention to the biggest event in local history?
And yet the first thing on his mind when he meets Kirk and Spock is getting a decent meal!
This guy is either very self absorbed or very unobservant. Either way, I no longer find it strange that he could over look the escape pod!