In an anomaly now known as Ben's Vortex, Ben McDaniel went underwater in 2010 for a night-time cave dive and never returned. Despite the extensive resources spent on finding him, no sign of him was every recovered, and instead... only mystery and loss were left in his wake.
Sources:
Atlas Obscura
Tampa Bay Times Archive
Boredom Therapy
Wikipedia- Vortex Spring
Wikipedia- Disappearance of Ben McDaniel
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