Eat your heart out, Jules Verne: This week, a ship packed with
scientists is setting out for a three-week Caribbean cruise to one of
the most extreme and least explored places on Earth. It's a real-life
trip that might have been ripped from the pages of the imaginative
novelist's fantastical fiction.
The 23 scientists aboard the research vessel Atlantis are embarking
on a first-of-its-kind mission; their quarry lies in the perpetual night
of the deep ocean, in a mysterious world powered only by the furious
heat of the planet's inner workings.
Their destination appears in Google Earth as a shadowy gash in the Earth just south of the Cayman Islands.
It is the Mid-Cayman spreading ridge, a rift in the seafloor some 70
miles (110 kilometers) long and more than 9 miles (15 km) across, where
geologic forces are shoving two tectonic plates apart and birthing new
oceanic crust — and fueling what may be two of the most remarkable
hydrothermal vent sites on Earth.
Until recently, it was thought that hydrothermal vents
— essentially, seafloor chimneys that spew forth a scalding soup of
chemically altered seawater — couldn't exist along the Mid-Cayman
spreading ridge, also called the Mid-Cayman Rise. It is the deepest
spreading ridge on Earth, plunging to nearly 20,000 feet (6,000 meters)
in places, and also among the slowest moving, creeping apart at just 0.6
inches (15 millimeters) per year. Scientists thought that, at such a
snail's pace, the system lacked the volcanic heat required to sustain a
hydrothermal vent.
But in 2009, scientists discovered two.
One vent, the Von Damm, may offer clues to how life first arose on
our planet. The other, dubbed the Piccard, lies 16,400 feet (5,000
meters) below the surface — the deepest vent ever discovered on Earth —
and may prove to be the hottest.
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