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Clean subglacial access: prospects for future deep hot-water drilling.

Keith Makinson1, David Pearce2, Dominic A Hodgson3

  • 1British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK kmak@bas.ac.uk.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|December 16, 2015
PubMed
Summary

Drilling into Antarctica's Subglacial Lake Ellsworth faced challenges, halting the project. Lessons learned are informing new clean hot-water drilling methods for future subglacial exploration.

Keywords:
clean accessdeep hot-water drillingenvironmental stewardshipsubglacial environment

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Area of Science:

  • * Polar Science
  • * Earth Science
  • * Drilling Technology

Background:

  • * Accessing deep Antarctic subglacial environments requires specialized drilling techniques adhering to environmental protection agreements.
  • * Clean hot-water drilling is the preferred method for reaching subglacial lakes, necessitating advanced systems for greater depths and operational integrity.
  • * The Subglacial Lake Ellsworth (SLE) project aimed for deep (3000m+) research using a clean deep-ice hot-water drill.

Purpose of the Study:

  • * To present lessons learned from the Subglacial Lake Ellsworth (SLE) drilling campaign's equipment failures.
  • * To outline viable technical options and operational procedures for future clean access to deep subglacial targets like SLE.
  • * To improve the success rate of subglacial exploration through shared knowledge and refined methodologies.

Main Methods:

  • * Analysis of equipment failures and operational issues encountered during the 2012 Subglacial Lake Ellsworth fieldwork.
  • * Review of experiences from other hot-water drilling programs and recent field testing.
  • * Development of improved technical options and operational procedures based on lessons learned.

Main Results:

  • * The Subglacial Lake Ellsworth (SLE) project experienced significant equipment issues in December 2012, leading to the abandonment of access holes.
  • * A failure to connect with a subsurface cavity was a critical issue encountered during the drilling operations.
  • * The study identifies key challenges and provides insights for overcoming them in future subglacial drilling endeavors.

Conclusions:

  • * Past drilling attempts at Subglacial Lake Ellsworth encountered insurmountable technical difficulties, halting the project.
  • * The collected data and lessons learned are crucial for developing more robust and successful future subglacial exploration strategies.
  • * Refined hot-water drilling techniques and operational protocols are essential for accessing deep Antarctic subglacial environments.