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The question is no longer ‘can they get in’ but rather ‘can you get out?’ This funky chain lock design is anything but fire-safe and far more a novelty than a functional piece of door hardware, but it is still rather ingenious nonetheless.
Constructed from titanium alloy, fixed in place with 10 different screws and load-tested to a whopping 700 pounds of force, if you can not figure this out you are essentially as good as dead. Also check out other designs by Art Lebedev.