KYIV, Ukraine—It was late January, and an elite Ukrainian team grabbed their tools for a special operation critical to their country’s resistance against Russia: an underwater drone, a hammer and a chisel. Their job was to repair a crack in a concrete structure at a power plant caused by a Russian missile strike. At risk was power and heating for thousands of homes in Ukraine’s capital. The challenge? The crack was underwater, and the repairs would have to take place as Russian missiles continued to land. The team succeeded in a risky operation lasting six days, one of the most…

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