NOVEL: Danger's Hour by James Frances

The submarine USS Tulsa speeds silently through the Norwegian Sea, tracking the newest Russian nuclear sub as it makes a trial run.  Then, out of the darkness, another sub appears--colliding with the Tulsa and sending her to the ocean floor.  As an international tem of rescuers is organized, the sotry starts to leak out, and a worldwide media blitz ensues--placing even more pressure on an already dangerous mission.

And all the while, inside the crippled ship, Commander Geoff Richter must struggle to maintain order and ensure the survival of his crew as the oxygen is slowly depleted, power systems begin to fail, and time runs out...