Strait of Hormuz: How months of closure creates challenges for ships

What Happened

• Even as shipping traffic through the Strait of Hormuz begins to partially resume following the June 2026 ceasefire, hundreds of vessels that have spent weeks or months anchored outside the strait face a complex set of technical, operational, and human challenges before they can return to normal trade.
• Over 1,550 commercial vessels — including oil tankers, LNG carriers, and general cargo ships — were stranded in and around the strait at the peak of the crisis in May 2026, with approximately 22,500 mariners trapped onboard.
• The most serious technical barrier is mines: the United States has indicated that clearing the strait of mines to a level of near-certainty could take up to six months, and any residual risk of mines is sufficient to deter marine insurers from providing coverage, which in turn halts commercial traffic.
• Vessels that have sat at anchor for extended periods face mechanical challenges including engine degradation, hull fouling (the accumulation of marine organisms on hulls, which reduces efficiency and requires drydocking), and cargo deterioration — particularly for tankers carrying crude oil or chemical cargoes that degrade over time or require temperature management.
• Human factors compound the problem: crew rest regulations under the Maritime Labour Convention (MLC) limit working hours, and crews that have been aboard for months may need to be rotated before voyages can safely resume, requiring coordination across global crewing markets.

Static Topic Bridges

Global Maritime Chokepoints and Their Economic Significance

A maritime chokepoint is a narrow waterway through which a large volume of seaborne trade passes, making it strategically and economically critical. The world's major chokepoints include the Strait of Hormuz (Persian Gulf to Gulf of Oman), the Strait of Malacca (Indian Ocean to Pacific), the Suez Canal (Red Sea to Mediterranean), the Strait of Gibraltar (Atlantic to Mediterranean), and the Bab-el-Mandeb (Red Sea to Gulf of Aden). Each carries a disproportionate share of global trade: Hormuz for energy, Malacca for manufactured goods and energy (East Asia), Suez for container and bulk cargo between Europe and Asia. A blockage at any one of these can raise global freight rates significantly.

Marine Insurance and the Lloyd's of London Framework

Marine insurance is a prerequisite for commercial shipping: no insurer coverage means no vessel can legally and commercially operate. The global marine insurance market is centred on Lloyd's of London, a specialist insurance market established in 1688. Lloyd's operates through syndicates of underwriters who cover war risk, hull, cargo, and P&I (Protection and Indemnity) risks separately. War risk insurance — covering vessels operating in conflict zones — is issued as a separate addendum and can be withdrawn on 48 hours' notice. The presence of mines in a strait triggers automatic exclusion or extreme premium loading, effectively closing the route to commercially insured shipping.

The Maritime Labour Convention (MLC) 2006

The Maritime Labour Convention, adopted by the International Labour Organization (ILO) in 2006 and entered into force in 2013, is the "fourth pillar" of international maritime law (alongside SOLAS, MARPOL, and STCW). The MLC sets minimum standards for seafarers' employment conditions globally, including maximum work hours (14 hours in any 24-hour period; 72 hours in any 7-day period), minimum rest hours, and maximum time aboard (typically capped at 11 months, with repatriation rights). Vessels stranded for months may be in violation of MLC crew rotation requirements, creating both a legal and humanitarian obligation on shipowners to arrange crew changes before voyages resume.

India's Energy Import Exposure and Strategic Petroleum Reserves

India is the world's third-largest oil importer, importing approximately 85% of its crude oil requirements. Of this, approximately 60–65% originates from the Gulf region (Saudi Arabia, UAE, Iraq, Kuwait), making the Strait of Hormuz the single most critical maritime link for India's energy supply. A prolonged closure of Hormuz forces India onto alternative routes (Cape of Good Hope), sharply increasing freight costs and delivery times. India maintains a Strategic Petroleum Reserve (SPR) across three underground cavern storage facilities — Mangaluru and Padur (Karnataka) and Visakhapatnam (Andhra Pradesh) — with a combined capacity of approximately 5.33 million metric tonnes (around 9–10 days of consumption). The SPR is managed by the Indian Strategic Petroleum Reserves Limited (ISPRL) under the Ministry of Petroleum and Natural Gas.

Key Facts & Data

• Vessels stranded near Strait of Hormuz (peak, May 2026): 1,550+
• Seafarers trapped: ~22,500
• Mine clearance timeline cited by US: up to six months
• Pre-crisis Hormuz oil throughput: ~21 million barrels/day (~21% of global petroleum liquids)
• Pre-crisis LNG share: ~20% of global LNG trade
• India's crude import dependency: ~85%; Gulf share ~60–65%
• India's SPR capacity: ~5.33 million metric tonnes (Mangaluru, Padur, Visakhapatnam)
• MLC 2006: entered into force August 20, 2013; max 14 working hours in 24 hours; 72 hours in 7 days
• Lloyd's of London: founded 1688; war risk cover revocable on 48 hours' notice
• DHL forecast for Hormuz normalization: 4–6 months minimum