That is exactly what happened in 1939. This giant snow cruiser carried five men and a Navy BI-plane and sufficient equipment for an exploring trip to last a year and it is missing.
The official story tells us that the Antarctic snow cruiser was intended to facilitate transport in Antarctica while the crew consisting of scientists conducted seismologic experiments, cosmic-ray measurements, and ice core sampling while living in the snow- and timber-covered Snow Cruiser.
As the Americans knew that the Germans were conducting a secret expedition in Antarctica, Admiral Richard E. Byrd received confidential orders from the White House for putting together an American expedition to Antarctica and these orders were a State Department secret, even the existence of the orders had been kept secret.
The possible reason for the expedition… the Americans wanted to be the first to gain entrance and to explore the legendary lands inside the earth beyond the pole.
But after The Snow Cruiser arrived at Little America in the Bay of Whales, Antarctica in early January 1940… the mystery begins… From this point on the snow cruiser was never mentioned again in the newspapers and it was as though the snow cruiser never existed.
The Admiral reported that the expedition “achieved much more than he thought possible including the discovery of 900 miles of unknown coastline that explorers had been seeking for a hundred years but also in this article he never mentioned the snow cruiser, even stranger what was that apparently he was never asked. The giant machine that had been on everyone’s minds and lips before Byrd left was might never had existed.
In 1958, an international expedition uncovered the snow cruiser again using a bulldozer. It was covered by several feet of snow but a long bamboo pole marked its position.
Later expeditions reported no trace of the vehicle and now more than 75 years later, it is still unsure where the snow cruiser is and the question remains what happened to the monster machine and the data it was designed to gather and the crew and support team that were left behind to carry on?
Source: http://ufosightingshotspot.blogspot.pt