Underground Pyramid base entrance, maybe.  One thing I can tell you is that what you are seeing is the Antarctic Triangle.  Put in to hide whats really there.  Underground City‘s they dont want you to know about or to find.  I have done some research and what I have found is other groups have tried to go to the Antarctic to find its secrets and have not returned or if they have will not talk about what they have found!

Have the Russian team inadvertently stumbled across something not meant to be seen, somethingburied many years ago by Aliens or earthly forces? Hopefully they will reveal all when they eventuallymanage to make contact… but in the world of conspiracy and secrets people have a habit of turningup dead.

A Russian team trying to reach the alien structure discovered by a roving satellite miles below the Antarctica  ice only have a limited period each year when work in the region is possible.
They last contacted their base on January 30th this year and they are now down to less than 48 hoursbefore temperatures fall to the lethal level and escape would be impossible!
The scientists carry Iridium satellite phones for communication, but there are black spots.
At the moment, nobody knows what has happened to them!
Read on for the full story.

In 1947 the US Navy under Admiral Byrd conducted Operation High Jump. The expedition to Antarctica involved 4000 naval personnel and 13 huge ships, including several large airplanes and helicopters. The goal was to map and catalog all of the coastline of the continent, including minerals and wildlife. The entire expedition was to last 6 months.

During the expedition a base was established at Little America, a coastal bay, and a tent city was constructed where aircraft could be maintained for the survey. Several teams of explorers were sent out to various corners of Antarctica with large format cameras for the photographic survey. When the crew photographing the region directly Southwest of the Australian continent arrived for their mission they were shocked. They radioed back that the coastal region was free of ice and that the water was 38F. They continued to take photographs and later returned to process the images.

Immediately after this event the entire expedition was halted and all ships and Naval personnel were made to return to the States. The results of the mission are still classified, after 60 years. Only Admiral Byrd, who was interviewed by a Chilean journalist on his trip home from the expedition, commented on the sudden return home. He stated that there was a danger which this expedition had encountered that posed a threat to every nation in the free world. He declined to elaborate on this.

http://rense.com/general32/aryan.htm   

For five years, the Germans carried out work for the creation of a secret project code-named “Base-211,” This has been determined by several independent experts. By the end of WWII, the Germans already had nine scientific enterprises where “flying disk” projects were tested. Many scientists are positive that at least one of these Third Reich enterprises was transferred to the Antarctic. Famous researchers of the Third Reich’s Antarctic mysteries, R. Vesko, V. Terziysky, and D. Childress, claim that from 1942, thousands of concentration camp prisoners, prominent scientists, pilots, politicians with their families, and members of the Hitlerjugend were taken to the South Pole via submarine. Some scientists believe that a German base still remains in the Antarctic. Moreover, it is even said that there is an underground Aryan city called New Berlin, which has a population of two million people.

http://www.bibliotecapleyades.net/antarctica/antartica12.htm

Representatives of three occult societies, “Thule”, “Vril” and “Ahnenerbe”, ran those projects.
Famous researchers of the Third Reich’s Antarctic mysteries, R.Vesko, V.Terzisky, and D.Childress, claim that from 1942, thousands of concentration camp prisoners, prominent scientists, pilots, politicians with their families, and members of the Hitlerjugend were taken to the South Pole via submarine. Some scientists believe that a German base still remains in the Antarctic. Moreover, it is even said that there is an underground Aryan city called New Berlin, which has a population of two million people.

This has been determined by several independent experts. By the end of WWII, the Germans already had nine scientific enterprises where “flying disk” projects were tested. Many scientists are positive that at least one of these Third Reich enterprises was transferred to the Antarctic.

An ancient hi-tech “city” nicknamed “Rainbow City” was reportedly discovered in Antarctica by a small group of American researchers in the late 1940’s.

Reportedly an on-site staff of 2000 was later stationed there to study the ancient mechanical devices, the operation of time-space portals, holographic records, and an ancient underground ‘rail’ system with Rainbow City being the central hub. Antigravity craft are also reportedly being used by the researchers.

~The Hefferlin Manuscript; Rainbow City and the Inner Earth People, by Timothy Green Beckley