Are you thinking of low-sidewall tires with side-by-side tubes? The run-flat tires I've seen had concentric inner and outer tubes.
The ultimate run-flat wheel:
bgr.com:NASA’s new titanium tires can never get a flat
It says titanium because that cool, but it's really a nickel-titanium alloy “shape memory alloy”.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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