Alien From L.A. (1988)

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Wanda's famed archeologist father has been missing for years. Out of the blue, she receives an unexpected letter from her father's colleague in Africa informing her that his disappearance is due to his presumed death after falling down a bottomless pit. Deciding to make the transcontinental journey in the hope of finding him alive, Wanda flies to Africa only to end up stumbling down the same pit as her father. Once at the bottom of the hole, she discovers that it's the gateway to a lost subterranean civilization - Atlantis! Unfortunately, the Atlanteans don't take too kindly to visitors from the Earth's surface...