== Production ==
In the mid 1930s, Noel Monkman was working with [[F.W. Thring]] making documentaries. Thring offered to back Monkman in making a dramatic feature, and provided him with a writer, [[John P. McLeod]]. Thring planned to make the movie after visiting Hollywood in 1936ref but died that year.
[[Cinesound Productions]] offered to buy the script but Monkman elected to make it himself. He formed a syndicate with Bruce Cummings and Commonwealth Laboratories, who provided the crew.refref
Filming commenced June 1937. The film was shot mostly on location in North Queensland, on the [[Great Barrier Reef]], the Yorke Peninsula and [[Torres Strait]]. [[Joe Valli]] started filming in June but [[Gwen Munro]] did not arrive until October.refref
After the location work was completed, some studio scenes were filmed at Commonwealth Film Laboratories' studio at the .ref
Music was collated from popular classics including [[Tchaikovsky]]'s Swan Lake.
=== Death of Crew Member ===
While filming underwater scenes on [[Green Island (Queensland)|]] in October, one of the divers, James Bell, died of [[myocarditis]]. Bruce Cummings, who was in charge of underwater photography, went down in a diving cylinder, followed a few minutes later by Bell, who was his assistant. A few minutes later Cummings noticed something was wrong with Bell. When they brought him to the surface he was dead.refref An inquest was later held which found no negligence.refref