It's a US refuelling facility, put this into Google:
77.41S 163.68E
http://www.scribd.com/doc/1000347/Na...sap-200506aeoi
http://www.nsf.gov/about/contracting...ces_tagged.pdf
Looks like it's used by helicopters flying from McMurdo, it's called Marble Point.
How did you find it though?