The One Who Controls the Sea, Rules the World

Outline

1. Introduction
2. Sea power as an enduring foundation of global influence
3. From ancient civilizations to European maritime empires
4. Alfred Thayer Mahan and the strategic theory of sea power
5. British naval supremacy and the making of a global empire
6. American maritime dominance and the post war international order
7. Oceans as the arteries of global commerce
8. Maritime chokepoints and their disproportionate strategic importance
9. Energy security and control of sea lanes
10. Naval power as an instrument of deterrence and power projection
11. China’s rise and the return of great power competition at sea
12. The Indo Pacific as the centre of contemporary maritime rivalry
13. Submarines, aircraft carriers, drones and the technological transformation of sea power
14. Maritime resources, the blue economy and the struggle beneath the oceans
15. Pakistan’s maritime geography and the strategic importance of the Arabian Sea
16. Gwadar, Karachi and Port Qasim as instruments of geo economic power
17. Limits of the proposition: sea power alone cannot guarantee global supremacy
18. From control of the sea to control of global connectivity
19. Conclusion

Essay

Human history has repeatedly demonstrated that great powers rarely remain great without access to the sea. Armies may conquer territory, industries may generate wealth and diplomacy may build alliances, but oceans connect all these elements of national power across continents. From the Mediterranean empires of antiquity to the British Empire and the contemporary United States, maritime superiority has enabled states to protect commerce, secure resources, project military force and influence distant regions. Even in an age of satellites, artificial intelligence and cyber warfare, the oceans remain the principal highways of physical global commerce. UN Trade and Development estimates that around 80 percent of international merchandise trade by volume is carried by sea. (UNCTAD) The proposition that “the one who controls the sea, rules the world” therefore contains considerable strategic truth. Yet modern sea power means more than possessing the largest navy. It includes ports, merchant fleets, supply chains, maritime technology, control of strategic chokepoints and the ability to keep sea lanes open. The power that dominates these networks acquires extraordinary influence over the economic and strategic foundations of the international system.

The importance of the sea predates the modern nation state. Ancient civilizations understood that maritime access expanded both wealth and influence. The Phoenicians established commercial networks across the Mediterranean, while Athens developed naval strength that became central to its political power. Rome eventually transformed the Mediterranean into what it regarded as its own maritime space, allowing movement of soldiers, grain and commerce throughout the empire. Centuries later, Arab and Muslim merchants connected the Middle East with East Africa, India and Southeast Asia through maritime trade. These civilizations demonstrated a fundamental principle: oceans do not merely separate territories; they connect markets, cultures and centres of political power. States capable of exploiting those connections acquire advantages unavailable to societies confined largely to land.

The European age of exploration transformed maritime power into global power. Portugal and Spain initially used superior navigation and naval capabilities to establish distant trading networks and colonies. The Dutch subsequently developed commercial and maritime strength that made a relatively small European country an extraordinary economic power. Britain eventually surpassed them all. Its naval supremacy allowed it to protect trade routes, establish colonies, secure access to raw materials and move military forces across the world. The British Empire's global reach was inseparable from the Royal Navy. Britain did not need to occupy every territory directly to exercise influence; control of maritime routes enabled it to determine where commerce could flow and where military pressure could be applied.

The strategic relationship between maritime supremacy and global influence was famously explained by American naval theorist Alfred Thayer Mahan in the late nineteenth century. Mahan argued that national greatness depended substantially upon sea power, which itself rested on factors such as geographical position, commercial activity, naval capability and access to suitable ports. His ideas influenced strategic thinking in the United States, Britain, Germany and Japan. The significance of Mahan's argument lay in recognizing that a navy was not an isolated military institution. Naval power protected merchant shipping, merchant shipping generated economic strength and economic strength sustained national power. Control of the sea was therefore part of a wider system connecting commerce with strategy.

Britain provided perhaps the clearest historical demonstration of this principle. For much of the nineteenth century, the Royal Navy possessed unmatched global reach. British ships protected trade routes linking Europe with Asia, Africa and the Americas, while naval bases provided logistical support across enormous distances. This maritime system helped London become a centre of global finance and allowed British industries to obtain raw materials and reach international markets. Britain's small geographical size did not prevent it from exercising influence over vast territories because maritime superiority multiplied its national power. The empire upon which the sun famously never set was sustained to a considerable extent by a navy upon which global commerce depended.

The twentieth century witnessed the transfer of maritime leadership from Britain to the United States. After the Second World War, the United States emerged with enormous naval, industrial and economic strength. Its fleets operated across the Atlantic, Pacific and Indian Oceans, while a network of overseas bases enabled rapid military deployment. American naval power helped protect the international trading system from which both the United States and its allies benefited. Aircraft carrier groups became visible symbols of this reach. When a crisis emerged thousands of kilometres from American territory, Washington could deploy naval forces without requiring immediate control of neighbouring land. Maritime supremacy thus became one of the foundations of the American led international order.

The economic importance of the oceans explains why such power matters. Modern globalization would be impossible without maritime transport. Containers filled with manufactured goods, tankers carrying oil and gas, and bulk carriers transporting grain, coal and minerals continuously cross the world's oceans. Shipping remains particularly efficient for moving enormous quantities of goods across long distances. Consequently, disruption at sea can rapidly affect factories, consumers and food markets thousands of kilometres away. Recent geopolitical tensions have demonstrated this vulnerability. UNCTAD reported that by May 2025 tonnage passing through the Suez Canal remained about 70 percent below its 2023 level as vessels rerouted around the Cape of Good Hope, increasing distances and transport costs. (UNCTAD) Maritime security is therefore inseparable from economic security.

Within this vast maritime network, certain narrow passages possess disproportionate importance. The Strait of Hormuz, Strait of Malacca, Bab el Mandeb, Suez Canal and Panama Canal are geographical bottlenecks through which enormous volumes of trade pass. Their strategic importance illustrates that controlling the sea does not necessarily require controlling every ocean. Influence over critical passages can shape global commerce. The Strait of Hormuz is particularly important for energy flows; UNCTAD's 2025 maritime review estimated that it carries about 11 percent of global trade and roughly one third of seaborne oil trade. (UNCTAD) Disruption of such a narrow waterway can therefore influence oil prices, shipping costs and economic conditions across continents.

Energy security further reinforces the importance of maritime power. Major industrial economies depend upon oil and liquefied natural gas transported through sea lanes from producing regions to consuming markets. China, Japan, South Korea, India and European economies all depend to varying degrees upon maritime energy supplies. Protecting tankers and keeping shipping routes open therefore becomes a strategic necessity. Recent disruption risks around Hormuz and Bab el Mandeb have again shown how quickly geopolitical conflict can force major shipping companies to change routes and operating patterns. (Reuters) A country may possess enormous economic wealth, but if its energy lifelines can easily be interrupted, its strategic vulnerability remains considerable.

Navies consequently perform functions extending far beyond fighting conventional wars. They protect shipping, deter adversaries, combat piracy, conduct surveillance, evacuate citizens and provide humanitarian assistance. More importantly, they project power. An army generally requires access to foreign territory before it can operate overseas, whereas naval forces can remain in international waters close to a crisis zone. Aircraft carriers effectively function as mobile air bases, while submarines can provide covert surveillance or strategic nuclear deterrence. Naval power therefore gives states political options without requiring immediate occupation of territory.

The rise of China has returned maritime competition to the centre of great power politics. China's extraordinary economic growth has made it deeply dependent upon international shipping for exports, energy and raw materials. Beijing has consequently invested heavily in naval modernization, ports and maritime connectivity. Its growing capabilities in the South China Sea and wider Indo Pacific reflect an understanding that a major economic power cannot remain strategically dependent upon sea lanes it lacks the capacity to protect. At the same time, the United States and its regional partners seek to preserve freedom of navigation and prevent any single power from dominating strategically important waters. The contest between Washington and Beijing is therefore increasingly maritime as well as economic and technological.

The Indo Pacific has consequently become one of the principal theatres of twenty first century geopolitics. The region connects the Indian and Pacific Oceans and contains some of the world's busiest commercial routes. China, the United States, India, Japan and Australia all possess major interests there. The South China Sea is particularly significant because competing territorial claims overlap with important shipping routes and potential natural resources. The Indian Ocean is equally important because it links Middle Eastern energy producers with Asian markets. Whoever possesses the ability to secure or threaten these maritime arteries gains strategic leverage far beyond the immediate region.

India's growing maritime ambitions also reflect this logic. With a long coastline extending into the Indian Ocean, New Delhi increasingly views naval power as essential to its emergence as a major power. Its geographical position places it close to shipping routes connecting the Persian Gulf with East Asia. India has therefore expanded naval capabilities and strategic partnerships in the Indo Pacific. This development has implications for Pakistan because the strategic competition between the two states is no longer confined to their land border. The Arabian Sea and wider Indian Ocean are increasingly important dimensions of South Asian security.

Technology is simultaneously changing the nature of maritime power. Aircraft carriers and large surface fleets remain important, but submarines, anti ship missiles, satellites, unmanned vessels and drones can challenge traditional naval superiority. Cyber warfare also creates vulnerabilities because ports, navigation systems and modern vessels rely heavily upon digital networks. UNCTAD has warned that increasing digitalization of maritime transport improves efficiency while simultaneously creating new cyber risks. (UNCTAD) Future control of the sea may therefore depend as much upon information, sensors, satellites and autonomous systems as upon the number of warships a state possesses.

The oceans are also becoming important because of the resources contained within and beneath them. Fisheries provide food and livelihoods to millions, while offshore oil and gas remain economically significant. Seabeds contain minerals that may become increasingly important for advanced technologies and the global energy transition. The blue economy includes shipping, ports, fisheries, coastal tourism, renewable energy and other activities connected with marine resources. Maritime power in the twenty first century consequently means not merely controlling movement across the surface of the ocean but possessing the scientific, legal and technological capacity to utilize maritime resources sustainably.

For Pakistan, the proposition that sea power shapes national power has particular relevance. Pakistan possesses a coastline along the Arabian Sea and lies close to the Strait of Hormuz, one of the world's most important energy corridors. Its maritime position connects South Asia with the Middle East and potentially with Central Asia and western China. Yet Pakistan's strategic thinking has historically been dominated by its continental security challenges, particularly its eastern and western land borders. This land centred outlook has sometimes caused the maritime dimension of national power to receive less attention than its economic importance deserves.

The numbers demonstrate why this must change. Pakistan's Planning Commission stated in its 2026 blue economy framework that nearly 95 percent of the country's total trade volume moves through its three major deep sea ports: Karachi Port, Port Qasim and Gwadar. (Planning Commission of Pakistan) Port Qasim alone reports handling more than half of Pakistan's seaborne trade and serves as an important energy hub through LNG, LPG and other terminals. (Port Qasim Authority) The security and efficiency of Pakistan's ports are therefore not merely maritime concerns. They directly affect exports, imports, industrial production and energy security.

Gwadar adds a wider strategic dimension. Located near major Arabian Sea shipping routes and relatively close to the Strait of Hormuz, it has become a central component of the China Pakistan Economic Corridor. Its long term significance lies in the possibility of connecting maritime commerce with Pakistan's road and rail networks and potentially providing greater connectivity towards western China and Central Asia. However, the strategic importance of Gwadar should not be exaggerated merely because of its location. A port creates economic power only when it attracts commercial traffic, possesses efficient infrastructure and connects productively with its hinterland. Geography creates opportunity; infrastructure, security and trade convert it into power.

Pakistan therefore requires a broader maritime strategy. Strengthening the Pakistan Navy remains necessary for protecting territorial waters, sea lanes and maritime infrastructure, particularly as the Indian Ocean becomes more competitive. Yet naval capability alone is insufficient. Pakistan needs efficient ports, a stronger merchant marine, modern shipbuilding and repair capacity, coastal development, sustainable fisheries and greater exploitation of its blue economy. Port connectivity with railways and industrial zones must also improve. A country cannot claim maritime power if foreign vessels carry most of its commerce while its ports remain disconnected from productive domestic industries.

The proposition that control of the sea equals control of the world must nevertheless be treated critically. Sea power alone has never guaranteed permanent supremacy. Imperial Spain possessed enormous maritime wealth yet declined because of economic and institutional weaknesses. Britain eventually lost its dominant position despite retaining significant naval capability because the relative economic power of the United States and other countries increased. The Soviet Union became a superpower primarily through continental military, nuclear and industrial strength despite never achieving global maritime supremacy comparable to the United States. Modern China similarly became an economic giant before possessing a navy capable of matching American global reach. Maritime power is therefore a multiplier of national strength rather than a substitute for it.

The rise of air power, nuclear weapons, space systems and cyber capabilities further qualifies the traditional argument. A modern state must dominate several interconnected domains rather than the sea alone. Satellites monitor oceans, aircraft attack ships from great distances, missiles can threaten fleets from land and cyber operations can disrupt ports without firing a shot. Nuclear deterrence also places limits upon how far maritime superiority can be translated into coercion against another nuclear armed state. No navy, however powerful, can exercise the kind of unrestricted command of the oceans that imperial fleets once sought.

Moreover, international law has transformed the concept of control. Modern maritime order is built partly upon freedom of navigation, territorial waters, exclusive economic zones and international conventions. Global commerce benefits when seas remain open rather than when one country literally owns them. The strongest maritime power therefore gains influence not necessarily by closing the oceans but by possessing the capability to keep important routes open, shape the rules governing them and deny adversaries the ability to disrupt them.

The meaning of the original proposition must consequently evolve. To control the sea in the twenty first century does not mean physically occupying every ocean. It means possessing sufficient naval, commercial, technological and diplomatic capability to influence the networks that move global trade. It means protecting ports and supply chains, maintaining access to strategic chokepoints and ensuring that one's own commerce cannot easily be strangled by others. Maritime supremacy is therefore increasingly about controlling connectivity.

Conclusion

“The one who controls the sea, rules the world” is not an absolute law of international politics, but history gives it remarkable credibility. From Athens and Rome to Britain and the United States, states capable of exploiting maritime space have repeatedly converted sea power into commercial wealth, military reach and political influence. The oceans remain indispensable because they carry around four fifths of international merchandise trade by volume and connect the energy, food, resources and manufactured goods upon which the global economy depends. (UNCTAD)

The contemporary struggle for maritime influence demonstrates that this strategic reality has not disappeared. American naval power continues to underpin its global reach, while China's naval expansion reflects its emergence as a major power. India is strengthening its presence in the Indian Ocean, and competition around the South China Sea, Strait of Hormuz, Bab el Mandeb and other chokepoints shows that geography continues to shape global politics.

Yet modern maritime power is broader than battleships and aircraft carriers. Ports, merchant shipping, logistics, satellites, submarines, digital networks, blue economy resources and technological capability all determine whether a state can convert access to the sea into national power. Control of the oceans has become control of the networks flowing through them.

For Pakistan, this lesson is especially important. A country through whose ports nearly all trade by volume passes cannot afford to treat maritime affairs as secondary to continental security. Karachi, Port Qasim and Gwadar are strategic economic assets, while the Arabian Sea provides Pakistan with access to the wider global economy. Pakistan must therefore strengthen not only its naval deterrence but its ports, merchant marine, coastal infrastructure, blue economy and regional connectivity.

Ultimately, however, no state rules the world through sea power alone. Economic strength, technology, institutions, diplomacy and military capability reinforce one another. A powerful navy without a productive economy eventually becomes unsustainable, while a powerful economy without secure access to maritime trade remains vulnerable.

The enduring wisdom of the proposition therefore lies in a broader truth: global power belongs disproportionately to those capable of securing the arteries through which global civilization functions. For centuries those arteries have been the oceans. Until international trade ceases to depend upon them, the struggle for influence at sea will remain inseparable from the struggle for influence in the world.