The area of the hollow is two-thirds of the size of Manhattan, and NASA researchers found it "alarming."
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Researchers have warned in advance that the huge Thwaites glacier could cause a collapse that could cause a sharp ice sheet that could raise the global sea level by 10 feet.
Researchers expect that at the bottom of Thwaites there will be some gaps between the ice and the rock, where ocean water can flow and melt the glacier from below.
The size of the apartment and the explosive growth rate of the newly discovered hole surprised them.
Researcher Eric Rignot of the University of California, Irvine said: "For years, we have thought that Thwaites is not firmly attached to the base underneath it.
"Thanks to the new generation of satellites, we can finally see the details."
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MORE: RSPCA appeal after dog found abducted and tied to tree branches in the middle of the road
NASA's IceBridge operation, which began in 2010 and explored the link between the polar region and the global climate, revealed a cavity in NASA's IceBridge.
The researchers also used data from the Italian and German synthetic aperture radar constellation.
These very high resolution data can be processed by a technique called radar interferometry to discover how the earth's surface below has moved between images.
"Fluctuations play an important role in glacier size," said study leader Pietro Milillo of NASA.
"As the glacier takes more heat and water, it melts faster."
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