Which documentary  was directed in part by James Cameron, Aliens of the Deep or Earth?
Earth (2007 film) Earth is a 2007 nature documentary film which depicts the diversity of wild habitats and creatures across the planet. The film begins in the Arctic in January of one year and moves southward, concluding in Antarctica in the December of the same year. Along the way, it features the journeys made by three particular species—the polar bear, African bush elephant and humpback whale—to highlight the threats to their survival in the face of rapid environmental change. A companion piece to the 2006 BBC/Discovery television series "Planet Earth", the film uses many of the same sequences, though most are edited differently, and features previously unseen footage.
Rob Nelson (biologist) Robert "Rob" Nelson (b. 1979, Denver, Colorado) is an American biologist, filmmaker, and television personality. He is a regular contributor to the Science Channel documentary series "What on Earth?" Effective spring 2017, he also became the host and participating researcher of the new Science Channel documentary series "Secrets of the Underground", which seeks to answer new as well as long-held legendary mysteries that lie beneath the surfaces of streets, buildings, earth, salt and fresh water, etc. He holds a B.S. in biology and marine science from University of Miami, a M.S. degree from University of Hawaii, Manoa, and a M.F.A. from Montana State University.