After a week of squeezing through the dangerous, mazelike cave network, divers Mikko Paasi and Norrased Palasing emerged from its muddy waters Wednesday to find a cause for hope. There, huddled on a rock, their headtorches still illuminated, were five villagers who had been trapped, missing — unknown if alive or dead — for eight days inside the flooded caves in Laos. “What a feeling!!!” wrote Paasi, who also played a role in the famous rescue of 12 schoolboys and their soccer coach from a Thai cave in 2018. “The task so far has been far from easy and everybody...