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Team probes buried Antarctic lake
Posted: April 3, 2007
Courtesy: Antarctic Sun
By Steven Profaizer
... Anandakrishnan and his team needed an extremely loud sound to make it down several kilometers to the lake and then echo back to the surface again, and so they turned to Pentaerythritol Tetranitrate (PETN) – one of the strongest known high explosives.
The team made 5-centimeter-wide holes 18 to 30 meters into the ice with a hot water drill that spits out 93-degree-Celsius water and lowered an explosive into each one.
Each of the approximately 100 charges was detonated one at a time and ranged in weight from a fifth of a kilogram to almost 5 kilograms.
“At the surface we don’t feel very much, but the sound travels down into the ice,” Anandakrishnan said.
The reflected signals were recorded on the surface of the ice by 150 geophones, which operate much like microphones but record vibrations in the ice instead of in the air.
Anandakrishnan and his team are now back in the United States with the seismic records of their month in the field. It takes a lot of data processing to turn the EKG-like seismic graphs into a profile of the lake ...
Source: www.antarcticconnection.com... ke.shtml
Originally posted by uberarcanist
The first link is self-sourcing and is therefore not credible, I haven't read the others entirely but initially they looked very promising.