<h3>Overview</h3> <p>On <strong>15 April 2026</strong>, three Iranian oil tankers – <strong>Deep Sea</strong>, <strong>Sonia I</strong> and <strong>Diona</strong> – carrying roughly <strong>five million barrels of crude</strong> became the first loaded vessels to navigate the <span class="key-term" data-definition="Strait of Hormuz — a narrow waterway between Oman and Iran that is a critical chokepoint for global oil shipments; its security is a key concern in international relations (GS3: Economy, GS2: Polity)">Strait of Hormuz</span> after the United States imposed a <span class="key-term" data-definition="U.S. blockade — a set of restrictions imposed by the United States to prevent the movement of sanctioned Iranian oil, reflecting the use of economic coercion in foreign policy (GS2: Polity, GS3: Economy)">U.S. blockade</span>. The movement was reported by maritime analytics firm <span class="key-term" data-definition="Kpler — a maritime data analytics firm that tracks vessel movements and provides real‑time information on global oil logistics (GS3: Economy)">Kpler</span> on <strong>17 April 2026</strong>.</p> <h3>Key Developments</h3> <ul> <li>The three tankers departed from <span class="key-term" data-definition="Kharg Island — Iran’s principal oil export terminal in the Persian Gulf, where crude is loaded onto tankers for overseas shipment (GS3: Economy)">Kharg Island</span> after loading on <strong>2, 8 and 9 April 2026</strong> respectively.</li> <li>All three vessels are subject to <span class="key-term" data-definition="U.S. sanctions — economic measures imposed by the United States to restrict trade and financial transactions with designated entities, often used to achieve geopolitical objectives (GS2: Polity, GS3: Economy)">U.S. sanctions</span>, limiting their access to Western insurance and financing.</li> <li>The passage marks the first sanctioned Iranian crude shipment through the strategic waterway since the blockade became operational in early 2026.</li> </ul> <h3>Important Facts</h3> <p>According to <span class="key-term" data-definition="Kpler — a maritime data analytics firm that tracks vessel movements and provides real‑time information on global oil logistics (GS3: Economy)">Kpler</span>, the three tankers together hold about <strong>5 million barrels</strong> of crude, representing a modest share of Iran’s total export capacity but a significant signal of Tehran’s intent to keep oil flowing despite pressure. The vessels are flagged under various registries, yet all are listed on the U.S. Treasury’s Specially Designated Nationals (SDN) list, meaning they cannot obtain standard maritime insurance from major providers.</p> <h3>UPSC Relevance</h3> <p>The episode illustrates several themes that recur in the UPSC syllabus: <br/>• <strong>Geopolitics of energy</strong> – control over the <span class="key-term" data-definition="Strait of Hormuz — a narrow waterway between Oman and Iran that is a critical chokepoint for global o