One Last Trip Across the Ocean

This poem basically says be careful who you trust, and where you go with that trust, except here, it's a shark you should be afraid of.

A triangle
piercing the clear blue
the interior coming out
circling your safety
barely keeping you alive
away from the darkness of its depths
waiting
yet it still circles
the sun goes down
yet it still circles
its persistence driven by hunger
small drops of life fall from above
Fog seems to lift you up higher
lightning streaks the sky of black
a deep roaring smuthers you only hope
your docile cries for help
yet it still circles
closer with each sign of fear
unable to control its eagerness
coming for you
thirst in its eyes
you both know how it will end
the pain shoots through you
climbing
the cold darkness swallows you
slapping you across the face
the nothing
it is gone
and so are you