A day at the lake ends in tragedy for a Caldwell church group.
Authorities say Joseph Clarke, 21, was swimming with friends Wednesday at Lake Bastrop when he went under, but never surfaced.
Frantic church members alerted rescue workers who began searching for Clarke shortly after two.
Five hours later, his body was recovered by divers.
The drowning has been ruled accidental.
Authorities believe fatigue and dehydration may have played a role.
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