Sea Fever (2019) is an Irish science fiction horror film directed by Neasa Hardiman. The film stars Hermione Corfield, Dougray Scott, and Connie Nielsen, and is noted for its blend of psychological tension and aquatic horror.

The story centers on Siobhán (Hermione Corfield), a marine biology student who reluctantly joins a fishing trawler crew for a research project. The trawler, captained by Gerard (Dougray Scott) and his wife Freya (Connie Nielsen), sets out into the Atlantic Ocean. Siobhán, who prefers solitude and scientific precision, struggles to fit in with the tight-knit and superstitious crew.

Their voyage takes a harrowing turn when the trawler becomes entangled in a mysterious, bioluminescent organism. The crew soon realizes that they have encountered a previously unknown and deadly sea creature. This parasitic organism starts infecting the vessel and its inhabitants, creating a claustrophobic and perilous situation.

As the infection spreads and tensions rise, Siobhán’s scientific knowledge becomes crucial for their survival. She must overcome her own fears and work with the crew to understand the nature of the creature and find a way to stop it before it destroys them all.

Sea Fever is praised for its atmospheric tension, intelligent storytelling, and strong performances, particularly by Corfield. The film combines elements of classic sci-fi horror with ecological and psychological themes, making it a compelling and thought-provoking thriller. It explores the fear of the unknown, the fragility of human life in the face of nature’s mysteries, and the importance of cooperation and trust in dire circumstances.