This is an entry in the #fiftywords story challenge by 
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Trapped beneath ice, freezing water surrounds me. My lungs ache. A bubble of precious air escapes my lips. I hammer at the opaque cold ceiling. In vein. It is too thick, too strong. Below, something stirs. It senses my terror, my nocturnal fear. Sharp teeth seek my flesh, my soul.
... A story in exactly 50 words. The picture is one of an icy puddle I took a couple of weeks ago.