Look at any picture of Antarctica and the North Pole, they look like copied and pasted snow.
"According to the report from the Inquisitr, Symmes planned to an expedition to explore the hollow with the help and funding from the government. However, he didn't get the help he needed and died in 1829 without achieving his lifelong dream.
Not soon after, many hollow earth theorists planned expeditions to explore the massive hole. However, due to some rare coincidences, some members of their expedition team died in an accident.
Mirror reported that Polar explorer Admiral Richard E Bird detailed in his diary his success of reaching inner Earth. According to him, he entered the hole and travelled 1,700 miles among mountains, vegetations, lakes, civilization and mammoth-like monster animals.
During the Nazi regime, the hollow earth theory is very much celebrated. According to the video, Adolf Hitler even ordered a research journey for a similar opening in the Antarctica. According to an article in Crystal Links, there are theories going around that Hitler with his men have found a refugee by entering the giant hole leading to inner Earth and up until now they are still enjoying their safe haven inside."