MAE SAI, Thailand — Heavy rainfall stymied efforts to rescue members of a youth soccer team trapped in a cave in northern Thailand by flooding underground passages faster than water can be pumped out, a senior official said Wednesday. Muddy water rising to the ceiling of one of the chambers has prevented Thai navy SEAL divers from progressing farther into the cave to where they think the 12 schoolboys and their coach, who went missing Saturday, may be sheltering.