Sea Fever (2020) is a gripping sci-fi horror film directed by Neasa Hardiman that combines eerie isolation, marine biology, and existential dread. Set on a fishing trawler in the vast expanse of the ocean, the film explores humanity’s fragile relationship with nature and the terror of the unknown lurking beneath the waves.

The story follows Siobhán (Hermione Corfield), a socially awkward marine biology student who joins the crew of a fishing boat to observe their practices. Her analytical mind clashes with the superstitious crew, including the stern captain Gerard (Dougray Scott) and his wife Freya (Connie Nielsen). When their trawler ventures into restricted waters, they encounter a mysterious and bioluminescent sea creature that attaches itself to their hull, infecting the ship and its crew with a deadly parasite.

As paranoia and fear take hold, the crew must decide whether to quarantine themselves or risk spreading the infection to others onshore. Siobhán, armed with her scientific knowledge and resilience, becomes an unlikely leader as the group confronts not only the biological threat but also the darker sides of human nature.

The film’s tension is palpable, with its claustrophobic setting and haunting visuals of the deep sea amplifying the sense of unease. The creature design is both mesmerizing and terrifying, blending beauty with grotesque realism. Hardiman’s direction keeps the narrative tight and suspenseful, while the film’s exploration of ethics, survival, and humanity’s impact on the environment adds a layer of depth to the horror.

Hermione Corfield delivers a standout performance as Siobhán, balancing vulnerability and determination as she navigates the crew’s skepticism and the escalating crisis. The supporting cast brings authenticity to the film’s portrayal of a small, close-knit group under extraordinary pressure.

Sea Fever is a thought-provoking and chilling experience, blending sci-fi and horror with a grounded, realistic approach. Its themes of contagion, isolation, and survival resonate deeply, making it a must-watch for fans of atmospheric thrillers and intelligent horror.