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

Accessing and sampling subglacial environments deep beneath the Antarctic Ice Sheet presents several challenges to existing drilling technologies. With over half of the ice sheet believed to be resting on a wet bed, drilling down to this environment must conform to international agreements on enviro...

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Bibliographic Details
Published in:Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
Main Authors: Makinson, Keith, Pearce, David, Hodgson, Dominic A., Bentley, Michael J., Smith, Andrew M., Tranter, Martyn, Rose, Mike, Ross, Neil, Mowlem, Matt, Parnell, John, Siegert, Martin J.
Format: Text
Language:English
Published: The Royal Society Publishing 2016
Subjects:
Articles
Antarctic
The Antarctic
Antarc*
Ice Sheet
Online Access:http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4685967/
http://www.ncbi.nlm.nih.gov/pubmed/26667913
https://doi.org/10.1098/rsta.2014.0304
Description
Summary:Accessing and sampling subglacial environments deep beneath the Antarctic Ice Sheet presents several challenges to existing drilling technologies. With over half of the ice sheet believed to be resting on a wet bed, drilling down to this environment must conform to international agreements on environmental stewardship and protection, making clean hot-water drilling the most viable option. Such a drill, and its water recovery system, must be capable of accessing significantly greater ice depths than previous hot-water drills, and remain fully operational after connecting with the basal hydrological system. The Subglacial Lake Ellsworth (SLE) project developed a comprehensive plan for deep (greater than 3000 m) subglacial lake research, involving the design and development of a clean deep-ice hot-water drill. However, during fieldwork in December 2012 drilling was halted after a succession of equipment issues culminated in a failure to link with a subsurface cavity and abandonment of the access holes. The lessons learned from this experience are presented here. Combining knowledge gained from these lessons with experience from other hot-water drilling programmes, and recent field testing, we describe the most viable technical options and operational procedures for future clean entry into SLE and other deep subglacial access targets.

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