something

[RiverNotch]

something dark floated just beneath the surface

This is two archetypal (or, to some, cliched) symbols, "something dark" and "floated just beneath the surface", mashed together into one straight line, without any plays in form (as in, neat line breaks or spelling errors to be analyzed), and without a context being built on (that is, it's just symbols that don't symbolize anything, even implicitly; it's half of what a poem generally is. The title doesn't help, either). This line may have a point, but without any novelties in style (sure, one could argue that the whole emptiness of the poem says something, but that's just too much), or developments in association, the point comes off as too obscure or general to be relevant. Well, at least that's how I read this.

tldr, eh?