Operación Isla del Oso

An announcement at the end of the closing credits reads "Coming Soon -Alistair MacLean's Goodbye California". This movie was intended as the first in a series of Alistair MacLean adaptations, which would have included "El Dorado", "Athabasca", "Night Without End", and "The Way to Dusty Death". The next intended movie in the series, "Goodbye, California", was to be shot with a budget of between $12-$13 million. However, due to this movie's disappointing box-office performance, "Goodbye, California", and the other titles were never made by producer Peter Snell, who had bought the rights to numerous MacLean works in 1975, including ones at the time that had not even been published or written yet. Snell, however, did get La torre de los rehenes (1980) and Mirada en la noche (1995) made for television.

When everyone is outside after the generator explosion it is blowing a blizzard, but the flames are rising vertically with minimal wind disturbance rather than being virtually horizontal, revealing that wind machines are being used just on the area where the actors are.

"Coming soon: Alistair MacLean's Goodbye California"

The Region 1 DVD has certain graphic elements removed. Most notably, the view of the captain Lansing's cabin presents the captain's corpse being handcuffed to bulkhead and another corpse sitting by the desk. (Later the viewer learns it was an SS operative.) However, in the censored version only a glimpse of the captain Lansing's corpse is shown, the SS-man is totally cut out. This censorship severely interferes with the plot, as it is crucial to the novel to understand the motives of captain Lansing.

Referenced in The Bond Essentials (2002)