Virginia Block III: The Revised Bow

“GDEB Receives $148M as Virginia Class Lead Yard” described changes to the Virginia Class submarine’s design that are expected to reach 20% of the $200 million savings goal by the time orders for the versatile sea attack/ land attack/ special forces submarines rise to 2 per year, in 2012.

The bow changes cover the FY 2009-2013 ships, referred to as Block III. SSN 774 Virginia – SSN 777 North Carolina are Block I, and SSNs 778-783 will be Block II. Block III begins with the 11th ship of class, SSN 784. Long lead time component orders began May 22/08, and the submarine is expected to be ready for delivery around 2015. A fuller explanation of Block III’s extensive bow changes, and an accompanying graphic, may be found below – along with contract updates that include additional improvements and sonar development.

Trident II D5 Missile: Keeping Up with Changing Times

Nuclear tipped missiles were first deployed on board US submarines at the height of the Cold War in the 1960s, to deter a Soviet first strike. The deterrence theorists argued that, unlike their land-based cousins, submarine-based nuclear weapons couldn’t be taken out by a surprise first strike, because the submarines were nearly impossible to locate and target. Which meant that Soviet leaders could not hope to destroy all of America’s nuclear weapons before they could be launched against Soviet territory. SLBM/FBM (Submarine Launched Ballistic Missile/ Fleet Ballistic Missile) offered shorter ranges and less accuracy than their land-based ICBM (Inter-Continental Ballistic Missile) counterparts, but the advent of Trident C4 missiles began extending those ranges, and offering other improvements. The C4s were succeeded by larger Trident II D5 missiles, which added precision accuracy and more payload.

The year that the Trident II D5 ballistic missile was first deployed, 1990, saw the beginning of the end of the missile’s primary mission. Even as the Soviet Union began to implode, the D5’s performance improvements were making the Trident submarine force the new backbone of the USA’s nuclear deterrent – and of Britain’s as well. To ensure that this capability was maintained at peak readiness and safety, the US Navy undertook a program in 2002 to replace aging components of the Trident II D5 missile called the D5 Life Extension (LE) Program. This article covers D5 LE, as well as support and production contracts associated with the American and British Trident missile fleets.

The USA’s E-6 Fleet: Take Charge, And Move Out!

The USA’s E-6 Mercury (aka. TACAMO, as in TAke Charge And Move Out) “survivable airborne communication system” airplanes support their Navy’s SSBN ballistic missile submarine force and overall strategic forces. With the advent of the new “Tactical Trident” converted Ohio Class special operations subs, their unique capabilities become even more useful. The E-6B version also has a secondary role as a “Looking Glass” Airborne National Command Post, and in recent years they have seen use as communications relay stations over the front lines of combat.

Delivery of the first production E-6 aircraft took place in August 1989, with delivery of the 16th and final airplane coming in May 1992. This is DID’s FOCUS Article concerning the E-6 system, which includes details concerning the capabilities and associated contracts. The latest contracts involve important fleet upgrades, as the Navy tries to drag the jet’s systems into the 21st century.

New Nukes: Britain’s Next-Gen Nuclear Missile Submarines

“We are committed to working towards a safer world in which there is no requirement for nuclear weapons… However, the continuing risk from the proliferation of nuclear weapons, and the certainty that a number of other countries will retain substantial nuclear arsenals, mean that our minimum nuclear deterrent capability, currently represented by Trident, is likely to remain a necessary element of our security.”     — UK SDSR, 1998

Britain has a big decision to make: do they remain a nuclear weapons power, or not? In an age of collapsing public finances and an uncertain long-term economic future, the money needed to design new nuclear missile submarines is a huge cost commitment that could crowd out other needs. Then again, in an age of collapsing non-proliferation frameworks, clear hostility from ideologies that want nuclear weapons, and allies who are less capable and dependable, the downside of renouncing nuclear weapons is a huge risk commitment. Pick one, or the other. There is no free lunch.

This article covers that momentous decision for Britain, and the contracts and debates associated with it.

India’s Project 75 SSKs: Too Late to Save the Submarine Force?

India’s submarine fleet currently consists of 16 boats: 10 Russian SSK Kilo (Sindhugosh) Class, 4 locally built SSK U209 (Shishumar) Class, a leased nuclear-powered Improved Akula Class SSN from Russia (INS Chakra), and its own INS Arihant SSBN. Most of the Kilos have been modernized, but readiness rates for India’s existing submarine fleet sits below 40%, and the U209s will have trouble lasting much beyond 2015. With Pakistan acquiring modern submarines, and Chinese submarine building exploding, expanding India’s submarine fleet became an obvious national priority.

In 2005, India confirmed that it would buy 6 Franco-Spanish Scorpene diesel submarines, with an option for 6 more and extensive technology transfer agreements. Unfortunately, 7 years after that deal was signed, “Project 75” has yet to field a single submarine. A poor Indian procurement approach, and state-run inefficiency, are pushing the country’s entire submarine force toward an aging crisis. This DID FOCUS article covers the Scorpene deal and its structure, adds key contracts and new developments, and offers insights into the larger naval picture within and beyond India.

SSGN “Tactical Trident” Subs: Special Forces and Super Strike

In the aftermath of the START-II arms control treaty, some of the USA’s nuclear-powered Ohio Class SSBN nuclear missile submarines were converted to become long range conventional strike and special operations SSGN “Tactical Tridents.” Four ultra-stealthy Ohio-class SSBNs had their 24 Trident II D-5 nuclear ballistic missiles removed. They were replaced with up to 154 Tomahawk cruise missiles, plus space in the sub for 66-102 special forces troops, special attachments for new Advanced SEAL Delivery System (ASDS) or older Seal Delivery Vehicle (SDV) “mini-subs,” and a mission control center. Unmanned Underwater Vehicles, and even UAVs for aerial operations, are expected to become equally important options over the SSGN fleet’s career.

These modifications provide the USA with an impressive and impressively flexible set of conventional firepower, in a survivable and virtually undetectable platform, which can remain on station for very long periods of time. As surveillance-strike complexes make the near-shore more and more hazardous for conventional ships, and the potential dangers posed by small groups continue to rise, America’s converted SSGN submarines will become more and more valuable. This updated, free-to-view article covers their origins and timeline, the key technologies involved, contracts from the program’s inception to the present day, with all 4 submarines back in service.

Saab Story: Sweden’s New A26 Submarines

Submarines remain the ultimate maritime insurance policy, which is why so many countries treat the ability to build or design them as a strategic capability. Sweden is trying to recover from a disastrous pair of assumptions in the early 21st century, and preserve both their industrial capabilities and their country’s defenses.

The narrow, shallow Baltic seas present their own special challenges, but Swedish designs have proven themselves very capable. In order to field their next-generation design, however, Sweden may have to do something unusual: partner with other countries…

CMC Program Defining Future SSBN Launchers for UK, USA

The USA’s Ohio/ Henry M. Jackson Class and Britain’s Vanguard Class SSBNs (i.e. nuclear missile submarines) will begin experiencing age-related risks by the late 2010s, and military programs of this type can easily take 15-20 years from concept to fielding. The Common Missile Compartment (CMC) sub-program will help to define one of the next-generation SSBN’s most important constraints.

CMC aims to define the missile tubes and accompanying systems that would be used to launch new ballistic missiles, successors to the current Trident II/ D5 missile fleet used by the USA and Britain. Key options under consideration include a widened diameter for each tube from 2.21m – 3.04m, and the potential for flexibility beyond nuclear missiles.

Submarines for Indonesia

Indonesia sites astride one of the world’s most critical submarine chokepoints. A large share of global trade must pass through the critical Straits of Malacca, and the shallow littoral waters around the Indonesian archipelago. That makes for excellent submarine hunting grounds, but Indonesia has only 2 “Cakra Class”/ U209 submarines in its own fleet, relying instead on frigates, corvettes, and fast attack craft.

South Korea’s Daewoo, which has experience building U209s for South Korea, has been contracted for Cakra Class submarine upgrades. Even so, submarine pressure hulls have inflexible limits on their safe lifetime, due to repeated hydraulic squeezing from ascending and descending. The Indonesians have expressed serious interest in buying 3-6 replacement submarines since 2007, with French, German, Russian, South Korean, and even Turkish shipyards in the rumored mix. Other priorities shoved the sub purchase aside, but a growing economy and military interest finally revived it. South Korea was the beneficiary, but further orders may be in store.

India’s Nuclear Submarine Projects

According to GlobalSecurity.org, India’s ATV (advanced technology vessel) program to build a nuclear-powered submarine began in 1974, and became a serious effort in 1985. The Federation of American Scientists’ December 1996 document “The Indian Strategic Nuclear Submarine Project: An Open Literature Analysis” remains one of the best single open sources on India’s program. Unfortunately, it was compiled over a decade ago and has become rather dated. That project has continued, and this DID Spotlight article continues to collect open source information on the ATV program.

More and more sources were claiming that a rented Russian Akula class boat would be operational as a training vessel by 2009. The concept was correct, but the date was not. A deadly accident during K-152 Nerpa’s sea trials delayed that project, and further complications pushed its hand-over date to 2012. As efforts to move the Nerpa into service continue, India has finally launched its indigenous nuclear sub Arihant, to begin sea trials and testing.