something

[Brownlie]

something dark floated just beneath the surface

Maybe a line break after floated?

[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?

[Erthona]

EW

Sorry, I did not intend for this critique to be this long, but I felt the explanation was necessary for the critique to be valid. However, as I have not been able to come up with anything that would benefit the poem, you may wish to by-pass the critique entirely.  
 

When something can mean anything, it means nothing.

Physical: since there is less light below the surface the darkness is a given, as the intervening medium blocks it off from the observer. So on the physical level it is simply a statement of fact. At the psychological level it would generally refer to the unconscious, specifically to hidden motivation, the ones we keep hidden even from ourselves, or anything else we are unaware of in our own psyche. This could also extend to such things as Jung's "collective unconscious" (shared archetypes as language), or Stanislaw Groff's accessible DNA. These are mainly "dark" because they are hidden or unknown to us. There is the corporate level, which includes governments, religions, and business. It is often referred to as the dark underbelly of business. It is something to the effect of a shoes company who spends a fair amount of money each year to give thousands of poor children free shoes (usually seconds, and tax deductible) while at the same time using labor of similarly aged kids who are paid starvation wages to make the companies shoes (this is where it begins to begin to be associated with evil). It could also apply to many other situation. That it has been applied to such a large extent and for so long it is a bit of a cliche depending on how it is used. You used another cliche, the trees forest one. What I see is this generates and keeps generating trees, that soon I am surrounded by a forest. Sorry, but I just don't see this as being a profitable way to go. That's my take on it today hopefully I am in error, nothing would please me more.

Dale        

[billy]

oops
is it a chocolate log?
while it has some sinister it doesn't for me have enough context. shark is the obvious object which is [unless a lifeguard says it on bondi beach] pretty mundane.
and yes it does have ambiguity and it could be about a mental or other condition but as it is, the shark thing screams out at me "leave the water now"

[just mercedes]

The title should be 'Nothing'.

[billy]

i think it should be

"it's not mine"

[RiverNotch]

busy looking for trees one often misses the forest.

there is no forest without trees