A marathon swimmer was ahead of schedule. Then he lost his AA batteries.
Briefly

Dreyer's attempt to swim 82.9 miles across Lake Michigan ended prematurely due to his GPS navigator dying, ultimately causing him to swim in circles.
The lack of just two AA batteries led to Jim Dreyer's unexpected decision to give up, illustrating how small issues can have significant consequences in endurance sports.
After nearly 24 hours in the water, volunteers found Dreyer, revealing he'd swum in circles since losing his navigation. This loss meant 47 miles still lay ahead.
Reflecting on his experience, Dreyer said, 'It's a hard pill to swallow that, you know, two batteries, that was the difference,' highlighting the fragility of such feats.
Read at Washington Post
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