Europe South Asia Asia Pacific Americas Middle East Africa BBC Homepage World Service Education

Front Page



UK Politics







Talking Point

In Depth

On Air

Low Graphics

Wednesday, July 28, 1999 Published at 17:45 GMT 18:45 UK


Deep-sea probe hunts new life-forms

Impression of a probe exploring under Europa's ice crust

By BBC News Online Science Editor Dr David Whitehouse

A deep sea probe, designed to withstand crushing pressures and extreme temperatures in its search for life, is to be tested in prototype in a Californian aquarium's giant kelp forest.

The new device houses underwater cameras, temperature sensors, optics and a spectrometer to analyse light. It will be lowered into the aquarium to test its ability to explore the interior of volcanic vents.

[ image: Tested in an aquarium]
Tested in an aquarium
These fissures in the sea floor are known to be home to a wide variety of organisms. As well as hardy micro-organisms, there are small animals, which have learned to live in crushing pressures, temperatures over 200 degrees Celsius and alongside toxic chemicals.

"These instruments will be able to record water temperatures in the throat of a vent, capture video and still images of the walls of the vent, and record spectral or fluorescent signatures of minerals and bioluminescent life dwelling in these crevices," said Dr. Arthur Lane, manager of the Underwater Volcanic Vent Mission at Nasa.

"In August and September we will probe the Pitcairn, McDonald and Teahitia seamounts near Tahiti, where hydrothermal vents are found in depths of 900 to 3,600 metres (3,000 to 12,000 feet)."

Scientists say that data obtained from the tests will aid in the future exploration of many extreme liquid and ice environments. The under-ice Lake Vostok in Antarctica will be one target. Eventually they hope to send probes to the Martian polar caps and the ocean thought to exist under the ice-crust of Jupiter's moon, Europa.

Strange life

[ image: Hydrotermal vents: life may survive inside them]
Hydrotermal vents: life may survive inside them
The recent and unexpected discovery of gelatinous material in underwater volcanic vents has opened a new avenue in the search for life and organisms that can survive in extreme environments.

Before it was seen, it was assumed that organisms only lived on the outside of the vents. However the layers of gel attached inside the vents are presumed to be the product of living organisms.

Researchers have even reported that the gel appeared to come directly from a vent throat.

"If there are indeed life forms present inside these vents, their presence may challenge accepted notions of the temperature ranges at which life can function," Lane said.

[ image: The ice-crust of Europa]
The ice-crust of Europa
"This year we're also testing a new light source and spectrographic instrument to see if we can gather more information about the bacterial growth we observed last year around the Loihi vent, what looked like thin veils of jellyfish-like material."

During this autumn's mission, scientists will use the French research vessel L'Atalante to test their instrument probe in several deep ocean volcanic vents in the South Pacific.

Once the technology has been developed and demonstrated to work at depths of 4,000 metres (13,200 feet), the probe's external shell will be modified for use in sub-glacial lakes like Lake Vostok. This is a two million-year old freshwater lake that exists deep beneath Antarctica's surface.

Advanced options | Search tips

Back to top | BBC News Home | BBC Homepage | ©

Sci/Tech Contents

Relevant Stories

28 Jul 99 | Sci/Tech
Toughest bug reveals genetic secrets

28 Jul 99 | Sci/Tech
Shrimps blinded by science

09 Feb 99 | Sci/Tech
Ocean vents were "factories of life"

22 Oct 98 | Sci/Tech
New hope of finding life on Mars

28 Aug 98 | Sci/Tech
Searching for life on Europa

Internet Links

Europa-Vostok initiative

The ocean's chimneys: Hydrothermal vents

USA vents program

The BBC is not responsible for the content of external internet sites.

In this section

World's smallest transistor

Scientists join forces to study Arctic ozone

Mathematicians crack big puzzle

From Business
The growing threat of internet fraud

Who watches the pilots?

From Health
Cold 'cure' comes one step closer