Mark Zuckerberg says he doesn't have a Hawaiian doomsday bunker, just a 'little shelter.' It's bigger than most houses.

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• Mark Zuckerberg is building a 1,400-acre compound in Kauai, Hawaii, with a vast basement.
• Plans for the compound show an underground structure nearly double the size of the average US house.
• In an interview with Bloomberg, Zuckerberg said it was only a "little shelter" for hurricanes and the like.

Mark Zuckerberg said the 4,500-square-foot underground structure in his Hawaii compound is just a "little shelter."

The...