Aliens (S01E05)

In the captivating episode "Aliens," Professor Brian Cox explores breathtaking locations on Earth to illustrate how natural laws have shaped wonders throughout the solar system. He plunges into the depths of the Pacific in a submarine, marveling at the unique organisms that thrive in the frigid, dark waters. Since water is essential for all Earthly life, the quest for extraterrestrial beings often aligns with the search for water in the cosmos. High above the striking Scablands in the U.S., Brian reveals striking geological similarities to Mars, formed by a colossal flood. Equipped with a gas mask, he ventures into a Mexican cave filled with bacteria that thrive on toxic gases, hinting that similar life forms could exist in recently discovered Martian caves.