Ocean Girl - Season 4 - Eps 1: Operation Sphinx
Brett and Jason are out testing a new diving suit when Jason encounters a strange bright light while under water, the pair quickly leave and head off to see Neri. Back on ORCA, Winston is puzzled by a magnetic anomaly on his scans of the ocean floor, even more strange is that the anomaly is in the shape of a perfect square. Dianne announces that she is going to pursue the vacant position of ORCA Commander. Jason matches the location of Winston's magnetic anomaly to where he saw the strange lights, Neri is also intrigued by the region prompting a closer investigation of the region. Neri swims out to the sight with Jason and Winston following in the minifin, ORCA's new underwater submarine. What they find surprises everyone—a huge underwater pyramid. Meanwhile, at Praxis headquarters (Preventative Response And eXtraterritorial Intelligence Service), agents Jake Shelby and Elly Hauser are dispatched to Egypt where reports suggest signals from outerspace are being received.
About Ocean Girl

Title: Ocean Girl
First Air Date: 1994-08-29
Last Air Date: 1997-12-22
Status: Ended
Rating: 7/10 (from 11 votes)
Language: EN
Seasons: 4
Total Episodes: 78
Network: Network Ten
Genres: Drama, Action & Adventure, Sci-Fi & Fantasy
Production Companies: Unknown
Synopsis
Ocean Girl is an Australian science fiction TV series aimed for family audiences and starring Marzena Godecki as the lead character. The show is set in the near future, and focuses on an unusual girl named Neri who lives alone on an island, and the friendships she develops with the inhabitants of an underwater research facility called ORCA. The show is an example of deep ecology science fiction.
Cast

Marzena Godecki
Neri

David Hoflin
Jason Bates

Jeffrey Walker
Brett Bates

Lauren Hewett

Kerry Armstrong

Liz Burch

Anthony Hayes

William McInnes

Christopher Kirby

Kristy Barnes Cullen