The 8-mile hole in a Hawaii national park that no one can explain

"It's very large, and very deep, and I wouldn't go alone."
70 points by elsewhen 8 days ago www.sfgate.com 44 comments

Summary

A mysterious 8-mile deep hole in a Hawaii national park has baffled experts, raising questions about its origins and safety. Discover what makes this enigmatic feature so intriguing and potentially dangerous.

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