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Gas bubbles coming out of the boiling vents at Giggenbach volcano were sampled in a tube with a pressure release valve. As the sub returned to the surface at the end of the dive, the sampled gas expanded by more then ten times, first pushing out the seawater in the tube, and then releasing the still expanding gas near the surface.

Related Links

New Zealand American Submarine Ring of Fire 2005

New Zealand American Submarine Ring of Fire 2005: April 18 Log

NOAA Ocean Explorer Gallery