The carrier-SSN balance in modern warfare is a necessity

RAdm. Sanjay Roye (retd)

Unconfirmed claims of an American aircraft carrier being targeted by Iran and the subsequent shifting of USS Abraham Lincoln’s deployment into the Indian Ocean has revived the age-old carrier versus submarine debate in a radically changed battlespace. The answer is no longer a simple ‘who wins?’ but a more nuanced recognition that carriers and SSNs serve different roles: one for power projection and sea control, the other for sea denial and undersea dominance. 

The carrier remains unmatched for sustained air power and political signalling, but it is also a large, visible, high value node that must be wrapped in a dense protective envelope. The carrier’s survival depends less on its own toughness and more on the strength of the layers around it. But then that is true for almost all big and visible assets--strategic bombers, fighter aircraft, air defence systems, missile bases, tanks, operation centres, formation headquarters, and so on.

Two Faces of Naval Power

Modern navies have long struggled with balancing tension between the aircraft carrier and the submarine. The carrier symbolises openness, presence and power projection; the submarine symbolises stealth, ambiguity and sea denial. For much of the 20th century, the carrier dominated the imagination because it visibly delivered combat air power across the sea. The submarine, by contrast, offered denial, attrition and covert leverage, but less visible glamour.

Today, that image is shifting. The carrier is still valued, but its very prominence in the battlespace makes it more vulnerable. The SSN, meanwhile, is seen as one of the most efficient means of holding high-value units at risk, because it can combine stealth with long-range sensors and weapons. The net effect is that navies can no longer realistically treat one platform as the ‘principal’ capital ship and the other as a secondary asset. The most effective fleets are those that explicitly design their force structure around the different roles each plays.

The Carrier’s Role

The aircraft carrier remains the most flexible instrument for projecting sustained air power at sea. It can launch repeated strike, air defence, electronic warfare and reconnaissance sorties from a position at sea, without dependence on foreign airfields or transient basing agreements. That is why, despite the cost and vulnerability, navies as diverse as the United States, India, China, the United Kingdom and France continue to invest in carrier capability.

Logically, the carrier is a sea control and power projection tool. It can:

•Provide air cover for surface fleets.

•Suppress enemy air defences and strike land targets.

•Deter adversaries through visible presence.

•Support amphibious or expeditionary operations.

•Sustain air operations in theatres where local airfields are limited or politically problematic.

These advantages are especially valuable in the Indo-Pacific and the Indian Ocean, where basing is often contested or constrained by host-nation sensitivities. For India, the ability to deploy INS Vikramaditya and INS Vikrant into the northern Arabian Sea, Bay of Bengal or the wider Indian Ocean gives the Indian Navy a powerful signalling and deterrence capability vis-à-vis both Pakistan and China.

SILENT KILLER INS Chakra

BUILDING CAPABILITIES INS Khanderi

But the carrier is ne