Astronautalis - Skeleton (everyone’s favorite)

It’s from his album The Mighty Ocean and the Nine Dark Theaters which might have better examples.

The song takes place on a beach, and the chorus features imagery of a young couple jumping off a bridge. The song itself mirrors TS Elliot’s The Waste Land in a way, I think. With its focus on age and beauty. Getting old is the theme.

Frightened Rabbit - Swim Until You Can’t See Land

This uses the ocean as sort of a metaphor. Staying on land is too difficult, so the singer starts to swim. Partially provoked by an unnamed woman, and partially by his desire to escape his past. Drowning in the ocean would be preferable to staying on land.