Glass Icefloes in a Warm Ocean: Genre Undetermined

He fell through the ice and was startled by the warmth of the ocean. It surged around him like comfortable bathwater, as warm and soothing as being swaddled in a blanket in front of the fire. The ice wasn't even cold. It shattered around him and--sunk. He snatched at a piece as it fell past him, and drew back his hand with a shout of pain that sent air bubbles spiraling upward through the blue green water above him. Dark black spirals of blood floated through the water. He kicked upward furiously. The water was so warm and comfortable, but his air was gone and there was his blood in the so-comfortable waters, summoning sharks and other predators that might not be as patient. Black spots began to dance before his eyes as he surged up into the light. His head broke the surface of the water and he inhaled in huge ragged gulps of frigid air. The air--

Inspiration: "How to survive if you fall through the ice"
Story Potential: High
Notes: I have no idea where this is going, but I rather want to find out.