Sunless sea

What is thalassophobia, you may ask? Thalassophobia is a persistent and intense fear of deep water, such as the ocean or sea. What makes this phobia different from aquaphobia — the fear of water in general — is the fact that it centers on vastness, darkness, and depth. People who have this condition are not terrified of getting wet but rather of the might and mystique behind the waves.

Dawn Machine - Sunless Sea

though, weirdly, this is the one i most often find on strange online merch/print stores

Sunless Sea