Into the Darkness

In 1997, underwater microphones placed during the Cold War picked up a terrifying sound. The sound was found to have traveled over five thousand kilometers, and had all the signs of being organic in nature. Something alive, and so terrifyingly large it was beyond comprehension. But then it went quiet for over twenty years.
Now it's back.
A high-tech science team is commissioned to build a submarine that can withstand the great pressure of the depths from which the sound is thought to have originated: the Mariana Trench. A mission is launched to dive deep into the darkness, hopefully finding and making contact with the mythical beast.
Meanwhile, Codi Cohl is entering a darkness of her own. She receives bionic lenses just before perfect blindness befalls her, and she makes a new friend in the process. A friend who might have the capability of putting her on that ship. But her fear of the darkness might envelop her long before the cold deep water of the ocean gets its chance.