Divers could teach boys to scuba and lead them out but expert says it would be risky
There are few more difficult environments for rescue efforts than flooded caves. Divers must navigate through darkness and kicked-up silt that can reduce visibility almost to nothing even with underwater lights, and progress is painstakingly slow .
The challenges have been starkly underlined as Navy Seal divers and other rescuers re-entered a partly flooded cave in northern Thailand on Tuesday to search for 12 boys and their football coach believed to have been trapped there for three days.
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