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Hydrothermal vents found inside a crater on the top of Giggenbach volcano are releasing streams of bubbles because they are hot enough to be at the boiling point for seawater (205 degrees C, 400 F) at this depth (165 meters, 540 feet). This is a rarely observed phenomenon, and these hydrothermal vents have the highest total gas content ever sampled, except for Eifuku volcano in the Marianas arc.

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