Ohio Class Nuclear Submarines

Ohio-class nuclear submarine that is a real successor of a series on nuclear submarines before, such as the Trident Class. Submarine was manned by 155 crew. Manufacture of submarines is extremely confidential, especially its nuclear reactor, none of the documents that can be tracked. But, obviously, all these submarine propulsion device following mechanical life support system in it (separation of water into the air, purifying sea water) is designed to be capable of operating up to 100 years old submarine. What does it mean? Suppose that the submarine was filled with food material, and sail around the ocean, the submarine was only stopped when the food material discharged, not because of its fuel runs out. The cost of making this submarine is about 2 billion USD (about 19 trillion USD.) Per unit. Currently the U.S. has 18 units of the Ohio-class nuclear submarines. Thus, the total worth of 18 billion USD (about 165 trillion USD.)