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Hutchison Port Holdings
Hutchison Port Holdings, branded Hutchison Ports, is the container terminal arm of Hong Kong's CK Hutchison Holdings, operating 53 ports in 24 countries that handled 90.1 million TEU in 2025.
Hydrofoil
A hydrofoil is a boat with underwater wing-like foils that lift its hull clear of the water at speed, cutting drag and enabling higher speeds.
Hyundai Mipo Dockyard
Hyundai Mipo Dockyard was a South Korean shipbuilder in Ulsan, founded in 1975, known for medium-sized tankers, and merged into HD Hyundai Heavy Industries in 2025.
I-400-class submarine
The I-400-class submarine (Sen Toku) was a class of Imperial Japanese Navy submarine aircraft carriers of World War II, designed to carry and launch floatplane bombers.
Ice class
An ice class is a notation assigned by a classification society stating a ship's hull strengthening and equipment for ice-covered waters, chiefly the Baltic FSICR and Polar Classes.
Icebreaker
An icebreaker is a ship whose reinforced, spoon-shaped bow rides up onto ice and fractures it under the vessel's own weight, keeping channels and harbors open for other ships.
Icon of the Seas
Icon of the Seas is a Royal Caribbean cruise ship delivered in 2023 as the largest cruise ship in the world, sailing year-round from Miami.
Icon-class cruise ship
The Icon class is a class of LNG-powered Royal Caribbean cruise ships built in Finland, whose lead ship Icon of the Seas became the world's largest cruise ship in 2024.
Idan Ofer (עידן עופר)
Idan Ofer (עידן עופר) is an Israeli billionaire shipping magnate, born in Haifa in 1955, who controls Singapore-based Eastern Pacific Shipping, chairs Kenon Holdings, and owns stakes in Atlético Madrid.
Imabari Shipbuilding Co., Ltd.
Imabari Shipbuilding Co., Ltd. (今治造船) is a Japanese shipbuilder founded in 1942, headquartered in Imabari, Ehime Prefecture, and Japan's largest by construction volume; it acquired a 60 percent stake in Japan Marine United in January 2026.
IMO global shipping carbon levy
A proposed mechanism by the International Maritime Organization to price greenhouse gas emissions from large ships on international voyages, drafted in 2025 as part of its Net-Zero Framework.
IMO Net-Zero Framework
The IMO Net-Zero Framework is a draft set of MARPOL amendments, approved in April 2025, combining a marine fuel standard with emissions pricing for large oceangoing ships.
IMO number
An IMO number is a permanent ship identification number, three letters and seven digits, introduced in 1987 and mandatory since 1996 for most passenger and cargo ships.
In situ preservation and reburial
In situ preservation and reburial is a conservation strategy protecting archaeological sites, especially underwater cultural heritage, in place; Article 2.5 of UNESCO's 2001 Convention makes it the first option.
In the Heart of the Sea
In the Heart of the Sea is a 2015 American historical adventure-drama film directed by Ron Howard, adapting Nathaniel Philbrick's account of the 1820 whaleship Essex disaster.
Inclining experiment
The inclining experiment is a ship test that measures lightship displacement and center of gravity by shifting weights across the deck and recording the heel angles.
Independence-class aircraft carrier
The Independence class was a class of nine light aircraft carriers built for the United States Navy in World War II by converting Cleveland-class cruiser hulls.
Independence-class littoral combat ship
The Independence class is a class of aluminum-hulled trimaran littoral combat ships built for the United States Navy by Austal USA, one of two LCS variants alongside the Freedom class.
Inflatable boat
An inflatable boat is a light watercraft with inflatable tubes for buoyancy, ranging from soft folding boats to rigid inflatable boats with hard hulls, common since World War II.
Ingalls Shipbuilding
Ingalls Shipbuilding is a shipyard in Pascagoula, Mississippi, founded in 1938 and now a division of Huntington Ingalls Industries that builds Navy destroyers, amphibious ships, and Coast Guard cutters.
INS Arihant
INS Arihant is India's first indigenously built nuclear-powered ballistic missile submarine, launched at Visakhapatnam in 2009, commissioned in 2016, and completing India's first SSBN deterrence patrol in 2018.
INS Tamal
INS Tamal (F 71) is a stealth frigate of the Indian Navy, commissioned on 1 July 2025 at Kaliningrad, Russia, the last Talwar-class frigate built there.
INSV Kaundinya
INSV Kaundinya is a stitched sailing ship of the Indian Navy, built entirely with traditional techniques and inducted in 2025; in 2026 it sailed from Porbandar to Muscat.
Intact stability
Intact stability is a ship's ability to remain upright and resist heeling while its hull is undamaged, a core discipline of naval architecture governed by the IMO's 2008 IS Code.
Integrated electric propulsion
Integrated electric propulsion (IEP), also called full electric propulsion, is a ship propulsion arrangement where a common electrical power system serves propellers and all other ship services.
Intermodal container
An intermodal container, also known as an ISO or freight container, is a standardized steel box that moves between ships, railcars, and trucks without handling the goods inside.
International 14
The International 14 is a 14-foot two-person development-class dinghy granted International status in 1928, and a primary testbed for engineering advances like the trapeze and spinnaker.
International Association of Classification Societies
The International Association of Classification Societies (IACS), founded in 1968, is a not-for-profit association of twelve classification societies whose rules cover over 90% of world cargo tonnage.
International Code of Safety for Ships Using Gases or Other Low-Flashpoint Fuels
The International Code of Safety for Ships Using Gases or Other Low-Flashpoint Fuels (IGF Code) is a mandatory IMO safety standard for ships using gas or low-flashpoint fuels, adopted in 2015.
International Container Terminal Services, Inc.
International Container Terminal Services, Inc. (ICTSI) is a Philippine port operator founded in 1987 to run the Manila International Container Terminal, now operating 34 terminals in 20 countries.