Mar sangriento (La gaviota roja)(1965)

La gaviota roja is a Spanish thriller that follows a morally ambiguous waterfront operator who rents a yacht from an unsuspecting married couple. What begins as a simple business transaction spirals into a dangerous conspiracy when all three become entangled in a clandestine mission. Tensions simmer beneath the surface as trust erodes and hidden agendas emerge. The film explores themes of deception and survival against the backdrop of the open sea, where escape becomes impossible and alliances fracture under pressure. Dark and atmospheric, La gaviota roja traps its characters in an escalating game where no one can be certain of anyone else's true intentions.