Give it to Nolan. He will bring time travel, theory of pseudo-relatively and everything else in it, in the end revealing it was actually all about espionage and

Give it to Nolan. He will bring time travel, theory of pseudo-relatively and everything else in it, in the end revealing it was actually all about espionage and those pods contained sensitive information that a clever time travelling agent has hidden on in. Shit, I just gave it away. Spoiler alert!