Hanauma Bay is one of the most popular tourist destinations on the Island of Oahu and has suffered somewhat from overuse. In 1956, dynamite was used to clear portions of the reef to make room for telephone cables linking Hawaii to the west coast of the US. The Hanauma Crater was created about 32,000 years ago during the Honolulu volcanic series, the latest burst of volcanic activity to occur on Oahu. The volcanic vents that formed Hanauma Crater opened on the sea floor. Upwelling magma vaporized the ocean water and steam explosions blew the magma into fine ash.
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