Answer: What In The World Happened Here? XCVIII: (98)

This is the way Krakatoa looked after the explosion:



The clue was just Anak Krakatau (Krakatoa's Child), which has changed since:



All in all, an interesting Island/Explosion combination. And it will blow again. They are considering building a bridge across the Sunda Straight, which is less than 30 miles from the growing monster.
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Verum audaces non gerunt indusia alba. - Ipsi dixit MCMLXXII