You’d want it to be nearly impossible to penetrate an aircraft black box, right? We would too.

Black boxes, or flight recorders, are meant to take a lot of wear and tear. After all, they’re supposed to survive plane crashes from tens of thousands of feet in the air, aboard metal vessels filled with jet fuel.

But the inside of a modern black box (spoiler: they’re not actually black) is a small wonder of strength and protection.

Needless to say getting inside them is no easy task. After dropping the box out of a helicopter to show its durability, the Youtube channel “What’s Inside?” cut the thing in half with a saw, so we could see a cross-section of the device that captures valuable data in the event of a crash.

Take a look inside:

Take A Look Inside A Black Box