How robots saved Notre Dame

As the first images of charred wreckage inside the Notre Dame cathedral appeared online Tuesday, engineers around the world said one observation was already clear: To return the ancient structure to its glorious past, builders will likely have turn to cutting-edge technology that many associate with the future.

Even before engineers had been able to access the deepest corners of the still-smoldering structure, design experts, preservationists and engineers were contemplating which modern technologies might be brought to bear to restore one of Europe's most iconic structures to its fabled past.

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