One of six underwater-themed sci-fiction monster movies released around 1989/90. Others include: The Abyss (1989), Leviathan (1989), Creatura degli abissi (1989), Abissi profondi (1989), La cosa degli abissi (1990), and Lords of the Deep (1989).
Deep Star Six (1989) was the first release of several underwater-monster-themed feature films released during 1989-90, including The Abyss (1989), Leviathan (1989), Abissi profondi (1989), and Lords of the Deep (1989), and 'The Rift' (aka 'Endless Descent', 1990). With the exception of 'The Abyss', none of these films were box office hits.
One of the many low budget so-called subsidy scandal films made in South Africa in the 1980s where fly by night filmmakers took advantage of and exploited a loophole ridden subsidy film assistance scheme.
The name of the wrecked Spanish galleon ship was 'The El Diablo'.
Filmed in 1987, but not released until 1989.