From National Geographic...
An enormous hydrothermal "megaplume" found in the Indian Ocean serves as a dramatic reminder that underwater volcanoes likely play an important role in shaping Earth's ocean systems, scientists report. The plume, which stretches some 43.5 miles (70 kilometers) long, appears to be active on a previously unseen scale.
"In a nutshell, this thing is at least 10 times—or possibly 20 times—bigger than anything of its kind that's been seen before," said Bramley Murton of the British National Oceanography Centre.
Hmmm. How will Katie Couric blame this on George Bush?