The Last Wave (1977)

Starring:

• Richard Chamberlain
• Olivia Hamnett
• David Gulpilil

IMDB.com
A Sydney lawyer has more to worry about than higher-than-average rainfall when he is called upon to defend five Aboriginals in court. Determined to break their silence and discover the truth behind the hidden society he suspects lives in his city, the Lawyer is drawn further, and more intimately, into a prophesy that threatens a new Armageddon, wherein all the continent shall drown.