Why Britain's $ 2.2 Billion Astute-Class Nuclear Submarine Is Its Most Dangerous Naval Asset 

The Astute-class submarines are the largest, most advanced and most powerful attack submarines ever operated by the Royal Navy, combining world-leading sensors, design and weaponry in a versatile vessel.
In the first part of 2012, they proved their ability to prepare and launch Tomahawk missiles, successfully firing 2 missiles from the Gulf of Mexico and accurately hitting the targets on the test range in Northern Florida.