delivering . Nuclear core life estimated at 33 years. Nuclear fuel manufactured by BWX Technologies. Test depth: greater than , allegedly around . Speed: Greater than , allegedly up to Planned cost: about US$1.65 billion each (based on FY95 dollars, 30-boat class and two boat/year build-rate) Actual cost: US$1.5 billion (in 1994 prices), US$2.6 billion (in 2012 prices) Annual operating cost: $50 million per unit (in 2012 prices) Crew: 120 enlisted and 14 officers Armament: 12 VLS & four torpedo tubes, capable of launching Mark 48 torpedoes, UGM-109 Tactical Tomahawks, Harpoon missiles and the new advanced mobile mine when it becomes available. Block V boats will have the additional VPM module which contains four large diameter tubes which can accommodate seven Tomahawk cruise missiles each. This would increase the total number of torpedo-sized weapons (such as Tomahawks) carried by the Virginia-class design from about 37 to about 65—an increase of about 76%. Decoys: Acoustic Device Countermeasure Mk 3/4 Blocks Block I Block I involved 4 boats and modular construction techniques were incorporated during construction. Earlier submarines (e.g., Los Angeles-class SSNs) were built by assembling the pressure hull and then installing the equipment via cavities in the pressure hull. This required extensive construction activities within the narrow confines of the pressure hull which was time-consuming and dangerous. Modular construction was implemented in an effort to overcome these problems and make the construction process more efficient. Modular construction techniques incorporated during construction include constructing large segments of equipment outside the hull. These segments (dubbed rafts) are then inserted into a hull section (a large segment of the pressure hull). The integrated raft and hull section form a module which, when joined with other modules, forms a Virginia-class submarine. Block I boats were built in 10 modules with each submarine requiring roughly 7 years (84 months) to build. Block II Block II involved 6 boats; they were built in four sections rather than ten sections, saving about $300 million per boat. Block II boats (excluding SSN-778) were also built under a multi-year procurement agreement as opposed to a block-buy contract in Block I, enabling savings in the range of $400 million ($80 million per boat). As a result of improvements in the construction process, New Hampshire was US$500 million cheaper, required 3.7 million fewer labor hours to build (25% less), thus shortening the construction period by 15 months (20% less) compared to Virginia.