The crack

Science fiction cinema, which has had so little experience in the Spanish industry, had in Juan Piquer a skilled director of the formats of this genre in its B series version. This film, which is also close to the cinema of horror, has its best value in the work of staging the interiors of the submarine, which is another protagonist of the plot, and in Mariné's photography that helps make an environment of fantastic and supernatural elements credible.

Synopsis: A NATO mission dives to a crevice 15,000 meters deep where an experiment seems to have caused strange mutations in the creatures that inhabit it and where a submarine has been lost to the that this second seeks to rescue. The Dannekin Rift will bring more than surprises to this group, who are unaware of the true nature of their expedition.