This is the toolkit spies carried in their butts
Spies have had all sorts of great tools and gadgets, from self-inflating blow-up dolls during the Cold War to special listening devices deployed around the world today. But perhaps one of the most surprising devices was the rectal toolkit issued to some CIA officers deployed into Soviet-era Europe.
As more and more CIA officers were sent into dangerous places in Europe, including the democratic enclave of West Berlin, the dark times called for dark solutions that could be stored in a dark place — a place so dark the sun don't shine.
Talkin' about butts. The CIA turned to officers' butts.
There was a high chance that CIA officers and assets could and would be jailed by secret police, even if it was just on suspicion of being aligned with the U.S. or other western countries. So, the CIA wanted to give these people the best possible chance of escaping custody. But since assets would likely be strip searched, there was really only a couple places left to hide the tools.
And so the large capsule was created, filled with tiny tools that would help officers pick locks and cut through fine materials. The exact tools and materials used varied between different "rectal toolkits," but all of them were made with materials that were thought unlikely to splinter. They were also very carefully made to prevent leaks that would allow, uh, outside materials into the capsule.
If an officer were captured, he would go through the search, hopefully retain his toolkit, and then fish it out after the guards had left. Not exactly the moment that anyone dreams about when joining an espionage service, but still way better suffering a prolonged hostile interrogation.
Searches of the CIA history archives have not shown a specific case where a U.S. asset fished out this toolkit and used it to make good their escape, so it's not clear if it saved any specific person's life or government secrets from Soviet spies.