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Robert Bunsa, 24, drowned during a contest to see who in a bachelor party could hold his breath underwater the longest. He suffered shallow water blackout, which happens when swimmers hold their breath for too long. They lose consciousness and drown, which often goes unnoticed by other swimmers. Water safety expert Jim Spiers told Inside Edition that holding your breath underwater is dangerous. Instead, slowly exhale and come up as soon as you need to breathe.