Guest Stars Steve Bisley as Commander Steve Marshall Morgan O'Neill as Lieutenant Darryl Smith Christopher Stollery as Federal Agent Greg Murphy Sibylla Budd as Dr. Ursula Morrell Daisy Betts as Sally Blake Lindsay Farris as Simon Connor Erica Lovell as Briony Walters Sam Smith as Declan Taylor Rebecca Barratt as Tanya Taylor Michael Beattie as Sea Nymph Crew 1 Craig Coventry as Sea Nymph Crew 2 Veronica Sywak as Tourist 1 Paul Lyons as Tourist 2 Kath Perry as Tourist 3 Kristy Brooks as Pretty Girl