The crew of a West of Ireland trawler, marooned at sea, struggle for their lives against a growing parasite in their water supply.


Neasa Hardiman


Neasa Hardiman
1 win & 2 nominations. See more awards »





Complete credited cast:
Hermione Corfield ... Siobhán
Dag Malmberg ... Professor
Jack Hickey ... Johnny
Olwen Fouéré ... Ciara
Dougray Scott ... Gerard
Connie Nielsen ... Freya
Ardalan Esmaili ... Omid
Elie Bouakaze ... Sudi


The crew of a West of Ireland trawler, marooned at sea, struggle for their lives against a growing parasite in their water supply.

Plot Summary | Plot Synopsis


See all certifications »

Parents Guide:

View content advisory »

Did You Know?


The early scene where the captain discusses paying shares with the two crew members who work below deck is a reference to the similar conversation in Alien between Dallas, Parker and Brett. This film shares many similarities with Alien despite the difference in setting. See more »


In the movie Freya states there is no way to contact the coastguard as the radio is broken. However on the bulkhead behind her there is an bright yellow EPIRB, an emergency beacon that can be activated and works via satellite. See more »


Johnny: Sea Fever... It Happens
See more »


Featured in WatchMojo: Top 10 Horror Movies of 2020 So Far (2020) See more »


Fado da Paixao
Composed and produced by John Gerard Walsh
See more »

User Reviews

Above average sea-monster tale
16 September 2019 | by Mamabadger56See all my reviews

This simple horror film takes the age-old fear of the sea serpent, modernizes it, and takes it to new heights. It starts with an unlikely heroine, nerdy graduate student Siobhan, who loves studying oceanography in virtual forms, and has to be pushed to get on a boat and examine it in real life. She finds herself on a small fishing boat, ill at ease with the boisterous crew, who start by exclaiming over the bad luck she, as a redhead, will bring to the voyage. Other seafaring myths and legends are of interest, including one, told to Siobhan by the boat's co-owner, Freya, which becomes relevant to the story. Some of the footage of undersea life not only further the story, but are remarkably beautiful. Siobhan does her best to fit in, and does make a connection with one or two of the crew members. Things take a sinister turn when the ship is impeded by a creature completely unfamiliar to either Siobhan or the crew. The more they investigate, the more dangerous the animal becomes. Suspense builds as the sea creature's intentions and abilities are gradually revealed, Siobhan tries to understand the creature's nature and possible weaknesses, and the crew works frantically to escape or summon help. The director has the sense to keep the monster mysterious as long as possible, adding to the tension. It's a well made, well acted, slow-burning horror story.

79 of 122 people found this review helpful.  Was this review helpful to you? | Report this
Review this title | See all 143 user reviews »

Frequently Asked Questions

This FAQ is empty. Add the first question.


Official Sites:

Official site


Ireland | UK | Sweden | Belgium | USA



Release Date:

10 April 2020 (USA) See more »

Also Known As:

Sea Fever See more »


Box Office

Cumulative Worldwide Gross:

See more on IMDbPro »

Company Credits

Show more on IMDbPro »

Technical Specs


Sound Mix:

Dolby Digital



Aspect Ratio:

See full technical specs »

Contribute to This Page

Recently Viewed