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its exterior made of a light metal resembling aluminum but so durable that no amount of heat (up to 10,000 degrees was applied) or diamond-tipped drill had the slightest effect. The disk apparently incorporated large rings of metal which revolved around a central, stabilized cabin, using an unfamiliar gear ratio. There were no rivets, bolts, screws or signs of welding. Investigators were eventually able to gain entry. Scully was told, because of a fracture in one of the portholes, which they enlarged, revealing a knob inside the cabin which when pushed (with a pole) caused a hidden door to open.