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Victoria University Antarctic Research Expedition Science and Logistics Reports 2004-05: VUWAE 49

*Differences from original Preliminary Environmental Evaluation (PEE)

*Differences from original Preliminary Environmental Evaluation (PEE)

In-situ investigation of crystal structure and stratigraphy during the drilling suggests that the ice at MES – although only 210m deep – might be as old as 200,000 years. This was unexpected but make the site scientifically exceptionally interesting. For this reason we requested to case the borehole, so that if our assumption proves to be correct, further sensitive borehole temperature measurements can be performed. The casing consists of a plastic bucket, which is has been dug 30cm into the borehole and anchored with two 2m long stainless steel rods, placed in a horizontal cross through the bucket. The vertical 3m long stainless steel rod has been frozen into the bucket and is kept in place by three rope guides. The structure was filled in with snow almost immediately, hence the lack of a close up picture.

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The structure is easily removable to allow access to the borehole and will be removed once the measurements have been conducted within the next 3 years.

Fig. 14: Borehole casing at MES

Fig. 14: Borehole casing at MES