Deep under the city of Niagara Falls lies the largest tunnel ever constructed. Soon to be completed it will supply a steady supply of water to the Robert Moses Power Plant, a facility that supplies most of the energy for the upper east coast of the United States. Jack and his team arrive to inspect the security of the project before it goes into operation, but Al Qaeda has other plans.

Taking over the facility the terrorist now hold the staff and the entire eastern seaboard hostage. Jack finds himself cut off and trapped. He has two problems. One, he's 400 feet underground, and two, one of the hostages is his wife.

The terrorist think they have the upper hand, but they don't know Jack.