it allows to imagine that something could be a "life" in Venus like conditions as well:

"Scientists once thought that no living thing could survive the harsh combination of toxic chemicals, high temperatures, high pressures, and total darkness at these vents. "

"Vent bacteria use hydrogen sulfide as their energy source instead of sunlight. "

http://seawifs.gsfc.nasa.gov/OCEAN_PLANET/HTML/ps_vents.html