A history-making eruption is about to destroy the Big Island of Hawaii. But a secret held for decades by the U.S. military is far more terrifying than any volcano. A history-making eruption is about to destroy the Big Island of Hawaii. But a secret held for decades by the U.S. military is far more terrifying than any volcano. A history-making eruption is about to destroy the Big Island of Hawaii. But a secret held for decades by the U.S. military is far more terrifying than any volcano. A history-making eruption is about to destroy the Big Island of Hawaii. But a secret held for decades by the U.S. military is far more terrifying than any volcano.