A March 1, 2004 Pravda article makes a startling revelation that the Western Press failed to pick up on.
The author, Olga Zharina, claims that circa 1996 American and British scientists discovered a time vortex or Time Gate over the south pole. As per US physicist Mariann McLein  researchers noticed a spinning gray fog above the pole which they believed to be a sandstorm. Clouds, as we know them do not generally form in the Antarctic. Over the poles you will from time to time see nacreous clouds. Nacreous clouds develop 50,000 to 80,000 feet in the atmosphere, and are due to a mix of meteoric dust and ice crystals, they are not formed in the same fashion that most clouds over the Earth are formed.
Over the course of time this fog / cloud neither moved or changed form it just lingered in the same spot. The researchers, curious as is their nature, decided to investigate by launching a weather balloon with equipment to register the wind speed, temperature and air moisture. Up, up and away went their beautiful, their beautiful baloon and lo and behold it vanished upon hitting the fog.
The pravda story is a little vague as to whether the first balloon had a tether attached or a subsequent one did, but in either event either the same or another balloon launched into the fog was brought back to the ground with the help of a rope. A chronometer in the weather balloon displayed the date of January 27, 1965, the same day 30 years earlier. The experiment was repeated a few times, each time the instrument displayed the past time. The phenomenon was called "the time gate".
The article went on to state investigation of this time gate is underway. The theory is that the gray fog is a vortex [ which pravda translated as 'whirl crater'] above the South Pole that serves as a sort of time tunnel. Multiple blogs and media reports attempt to link this time gate to a mysterious artifact allegedly discovered by the US military. The claim is that this 'artifact' is 12,000 years old and generates the gray fog / time gate.
Note - 1. Only references found to this person [Mariann McLein] are related to this Pravda story. There is no proof she actually exists.