Did The Lost Soviet Flyers
Vilhjalmur Stefansson, in his book, UNSOLVED MYSTERIES OF THE ARCTIC, explains how on August 12, 1937, a four-engine aircraft of passenger type left Moscow, bound for Fairbanks, Alaska via the Arctic with a crew of six seasoned flyers and were lost and never found even after a year of diligent search.
Most likely, the Lost Soviet Flyers flew into our Hollow Earth by accident.
Stefansson wrote in his book, that the Soviet Flyers encountered a stronger wind as they approached the pole than the forecasts had led them to believe. They reported that at 20,000 feet the wind was about 62 miles an hour and was cutting almost that many miles from their speed because it was nearly straight against them.
Stefansson reported that everything continued well for nearly two hours after they crossed the pole and that they were moving down upon Alaska on the Fairbanks meridian. Then came the only distress message, that they had been forced to descend from 20,000 feet where they had been flying in bright sun shine to the 13,000 foot level because one of the four motors had gone dead from an oil line damage. The last words heard were, "Do you hear me?" and "We are landing in..." Unintelligible messages were received over the next several days, but became gradually weaker until they finally died out.
Subsequent rescue missions were flown both from the Soviet side and the Canadian and Alaskan side of the Arctic over the next year looking for the downed Soviet Flyers but they were never found.
After reviewing all the downed Arctic fliers that had ever been known to come down in the Arctic, Stefansson concluded that the Soviet Flyers were the only ones that had ever been lost in the Arctic. The Americans alone flew about 40,000 miles in search of the Lost Soviet Flyers over a period of about one year covering the Arctic on the Canadian side of the pole down into Alaska. See a National Geographic map of those search flights here:
Russian search flights flew up to the pole, but did not cross over. Most likely, had they retraced the exact path taken by the Lost Soviet Flyers, they, too, would have been lost and gone inside the earth through the North Polar Opening.
Perhaps the Soviet Flyers did not even attempt to cross the Arctic over the North Geographic Pole, as the above National Geographic map indicates. Their last known position near land was when they passed the tip of Severny Island as they passed out of the Kara Sea. Perhaps, at that point, they set a course directly across the Arctic towards Fairbanks without even attempting to go over the geographic North Pole. In that case, as you can see in the Google map below, their route would have taken them exactly through the North Polar Opening.
Since they would have arrived at a point on the rim of the Polar Opening and determined with their Sextant that they had somehow arrived at the North Pole, they reported that it was a head wind that had slowed them down because they arrived at that point sooner than they had expected.
Since all the rescue flights were based on the assumption that the Soviet Flyers had flown across the geographic North Pole, when in reality they did not, the rescue flights did not find the polar opening because their search flights were in another direction – up near the geographic pole instead of at the location of the polar opening at 85 N latitude and 130 E longitude.
The Soviet Flyers probable flight path across the Arctic that took them directly into the Polar Opening.
After about two hours they would have reached the inner continent and so decided to descend to see what they had found. From that point on, their radio signals were received in gradually weaker form as they descended further into the interior of the earth.