화성의 비밀을 찾아서: 탐사，거주가능성，다른 비밀들 ２부 중 1부

One possible area for life and human habitats are underground Martian caves. A series of seven openings have been spotted by the Mars Odyssey orbiter. These openings are around 100 to 300 meters wide and could be entrances that lead to underground cave systems 100 meters beneath the surface. Supreme Master Ching Hai once said:” The mass extinction happened 40 million years ago. There were survivors, the first survivors were about 2 million people. And now they have about 5 million, 8 hundred thousand. They live underground.”