What are US nuclear submarines capable of? | BBC News

Key Concepts:

• Nuclear-powered submarines (SSN) vs. nuclear ballistic missile submarines (SSBN)
• Hunter-killer submarines vs. bomber submarines
• Tomahawk Land Attack Missiles (T-AMs)
• US Nuclear Triad (Submarines, Strategic Bombers, Land-based Missiles)
• Continuous At-Sea Deterrent (CASD)
• Credible Second Strike Capability
• Submarine operational readiness
• Cybersecurity vulnerabilities of Russian submarines

1. Submarine Capabilities: Hunter Killers (SSN) vs. Bombers (SSBN)

• SSN (Submarine Nuclear-powered Attack):
  • Examples: Los Angeles class, Seawolf class, Jimmy Carter class (US Navy).
  • Powered by a nuclear reactor but do not necessarily carry nuclear weapons.
  • Equipped with Vertical Launch Systems (VLS) to launch Tomahawk Land Attack Missiles (T-AMs).
  • Used for targeting other submarines, surface ships, surveillance, and reconnaissance.
  • T-AMs have been used to "soften" Iranian nuclear sites.
• SSBN (Submersible Ship Ballistic Missile Nuclear):
  • Example: Ohio class submarine (US Navy).
  • Carries nuclear weapons via ballistic missile delivery systems.
  • The Ohio class can carry up to 24 Trident II nuclear-capable ballistic missiles.
  • UK refers to this capability as Continuous At-Sea Deterrent (CASD).

2. The US Nuclear Triad

• Consists of three components:
  • Bomber Submarines (SSBNs): Provide a stealthy and survivable platform for nuclear weapons.
  • Strategic Bombers:
    • B-2 Spirit: Conducted attacks on Iranian nuclear sites; long-range capability.
    • B-52H Stratofortress: Can carry up to 20 air-launched nuclear-capable cruise missiles.
  • Land-Based Ballistic Nuclear Missiles: Provide a quick-response capability.
• The submarine component of the triad is the least vulnerable to a first strike due to its stealth and underwater operation.
• The main mission of SSBNs is to maintain a credible second-strike capability, ensuring retaliation even after a devastating first strike.

3. Operational Readiness of Submarines (Bob Fancy's Insights)

• Submarines deploy from home ports "ready for war," with routines adjusted for immediate combat transition.
• Example: HMS Trafalgar (hunter-killer submarine) deployed rapidly after the September 11th attacks, integrated with US Navy fleets, and conducted strike operations, surveillance, and intelligence gathering in the Indian Ocean, Persian Gulf, and Gulf of Aden.
• Submarines are capable of a wide variety of operations, often deployed for extended periods with limited contact with the outside world.

4. Analysis of Trump's Comments on Repositioning Submarines

• It's unlikely Trump was referring to SSBNs, as their patrol areas are vast and highly secret.
• More likely, he was referring to SSNs, signaling a potential increase in intelligence gathering or surveillance activities.
• Talking about submarines can increase anxiety due to their destructive capabilities.

5. US vs. Russian Submarine Capabilities

• During the Cold War, the US had a significant advantage over Soviet submarines.
• Russia has since proliferated its technical capabilities and fleet size, closing the gap.
• The US fields around 70 submarines, while Russia fields around 60.
• The US likely still has an advantage, but there is no room for complacency.

6. Ukrainian Intelligence Hack on Russian Borei-Class Submarine

• The leaked data is likely low-level classification, related to sea trials and crew training.
• The cyberattack itself is a significant embarrassment for Russia, highlighting cybersecurity vulnerabilities.
• The technical information released may not be highly significant, but the potential for other compromised data remains a concern.

7. The UK's Submarine Capabilities

• The Royal Navy and the American Navy have an extraordinarily strong relationship, especially in submarine services.
• The technical capability and proficiency of Royal Navy submarine crews are exceptional.
• However, the UK has a small number of submarines:
  • Four SSBNs, allowing for one on continuous at-sea deterrent patrol.
  • Five SSNs (increasing to seven), with only two or three deployable for operations at any given time due to maintenance and training.
• The UK faces a serious problem in terms of the number of submarines it can field into combat.

8. Credible Second Strike Capability

• The US maintains a "credible second strike capability" with its SSBN fleet.
• This means that even if the US suffers a devastating first strike, enough submarines would survive to launch a retaliatory strike.
• This capability is a key component of nuclear deterrence.

9. Conclusion

The discussion covers the nuances of submarine warfare, nuclear deterrence, and the current state of submarine capabilities among the US, Russia, and the UK. It highlights the importance of maintaining a credible second-strike capability, the ongoing competition in submarine technology, and the potential vulnerabilities of even the most advanced systems to cyberattacks. The insights from both the military analyst and the former submarine commander provide a comprehensive overview of the strategic importance of submarines in modern warfare.