On 13 December 1977 audiences first got to see The_Last_Wave movie. https://www.imdb.com/title/tt0076299
"Learning more about Aboriginal practices and the concept of Dreamtime as a parallel world of existence, Burton comes to believe the strange weather bodes of a coming apocalypse.
The film climaxes in a confrontation between the lawyer and the tribe's shaman in a subterranean sacred site. Overcoming the shaman, Burton escapes to the surface, but in the tunnel loses various tribal relics. After emerging from the sewer, he collapses on the beach and stares entranced at the horizon. The screen is filled by the shot of a towering ocean wave, though it remains unclear whether we are witnessing reality or sharing in Burton's final, apocalyptic premonition." https://en.wikipedia.org/wiki/The_Last_Wave#Plot
As Burton investigates, he learns the remains of an ancient civilisation still exist below the streets of Sydney, and that his dreaming is way of alerting him to an approaching apocalypse, the imminent destruction of the city by a giant wave.
Burton escapes from a subterranean sacred site, which seems to show South American Indians once made their way to Australia, and seeks to warn Sydney of its fate, but he's too late …
https://www.ozmovies.com.au/movie/last-wave
