A character exhibits an intense and persistent fear of the sea or other large bodies of water that appear vast, dark, deep, and dangerous.

Notes:
A fear of sea travel is indicative of this phobia, although other factors could be behind the feeling. This theme should not be applied if a character simply fears sea sickness, or separation from home.

Examples:
In "The Truman Show" (1998), Truman became paralyzed with fear when confronted with the idea of embarking on a boat because in his youth he had lost his father in a boating accident caused by a sudden storm.

References:
https://en.wikipedia.org/wiki/Thalassophobia https://en.wikipedia.org/wiki/Aquaphobia