All articles starting with S
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Sea star wasting disease
Sea star wasting disease (SSWD) is a lethal sea star disease that emerged in 2013 from Mexico to Alaska, killed over 5 billion sea stars of 20+ species, and was identified in 2025 as the bacterium Vibrio pectenicida strain FHCF-3.
Sea state
Sea state, also known as state of the sea, is the condition of the ocean surface described by wave height, period, and direction, coded 0 through 9 on the WMO scale.
Sea surface height
Sea surface height (SSH) is the height of the ocean surface above a reference surface, the ellipsoid or the geoid, measured continuously by satellite radar altimetry since 1992.
Sea surface temperature
Sea surface temperature (SST), also called sea temperature, is the temperature of the ocean's uppermost water, measured from ships, buoys, and satellites and classed as an essential climate variable.
Sea transport of grain tribute (Haiyun)
Sea transport of grain tribute (Haiyun, 海运) was the Qing practice of carrying tribute grain from the Yangzi delta to Tianjin by sea, replacing the blocked Grand Canal.
Sea trials
Sea trials are the on-water test program for a new or modified ship, demonstrating propulsion, maneuvering, and systems performance against contractual and regulatory criteria before delivery.
Sea turtle
Sea turtles are ocean-adapted marine reptiles of seven species, including the green turtle (Chelonia mydas) and Kemp's ridley. They migrate thousands of miles to nest; bycatch, poaching, and habitat loss threaten six of seven species, though most populations are improving.
Sea Turtle Museum
Sea Turtle Museum (Kumejima Umigame-kan, 久米島ウミガメ館) is a 2012 town-run sea turtle aquarium and conservation facility on Oku Island, Kumejima, Okinawa, distinct from Churaumi's Umigame-kan, Yakushima Umigame-kan, and Caretta.
Sea turtle pavilion
A sea turtle pavilion is an aquarium or park facility for displaying sea turtles, combining a large pool with above- and underwater viewing and educational panels.
Sea urchin
Sea urchin (Echinoidea), spiny echinoderm with Aristotle's lantern jaws and tube feet; grazes kelp, forms urchin barrens when predators are lost; roe eaten, Diadema suffered 1983 and 2022 Caribbean die-offs.
Sea urchin as food
Sea urchin as food means eating the animal's gonads, sold commercially as uni and prized raw in Japanese cuisine; Japan consumes roughly 80-90% of world supply.
Sea Witch (clipper)
The Sea Witch was an American extreme clipper launched in New York in 1846, designed by John W. Griffiths and built for the fast China tea trade.
Sea You Festival
Sea You is a three-day electronic music festival held every July at the Tunisee lake near Freiburg im Breisgau, Germany. It began in 2014 as successor to the Sea of Love festival.
Sea-class workboat
The Sea-class workboat is a family of modular, multi-role workboats built by Atlas Elektronik UK for the British Royal Navy under Project Vahana, with 35 boats delivered from 2018 to 2024.
Sea-going wireless operator
A sea-going wireless operator, later called a radio officer, was a mariner who ran a ship's radio telegraph station, keeping the distress watch until GMDSS ended the role.
SEA-H2X
SEA-H2X, the South-East Asia Hainan-Hong Kong Express, is a 5,746 km submarine communications cable led by China Mobile and entering commercial service in July 2026.
SEA-LION
SEA-LION (Southeast Asian Languages in One Network) is a family of open large language models built by AI Singapore, first released in December 2023 to serve Southeast Asian languages.
SEA-ME-WE 3
SEA-ME-WE 3 (SMW3) was a submarine optical-fiber cable linking Western Europe, the Mediterranean, the Middle East, South Asia, and East Asia, and at 39,000 km was the world's longest.
SEA-ME-WE 5
SEA-ME-WE 5 is a 20,000 km submarine communications cable connecting 17 countries from Singapore to the Middle East to France and Italy, built by 19 telecom operators and in service since December 2016.
SEA-ME-WE 6
SEA-ME-WE 6 (Southeast Asia–Middle East–Western Europe 6) is a submarine cable from Singapore to Marseille with 17 landing points and a design capacity of more than 126 Tbps.
Sea-Monkeys
Sea-Monkeys (Artemia nyos) is a novelty pet brand of brine shrimp kits created by Harold von Braunhut, first sold in 1960 via comic book ads; genetic studies place the animals in the Artemia franciscana superspecies, now owned by Transcience LLC.
SEA-PHAGES
SEA-PHAGES (Science Education Alliance-Phage Hunters Advancing Genomic and Evolutionary Science) is HHMI's two-semester undergraduate course in which beginning students discover and annotate novel bacteriophages; over 50,000 students have isolated 23,000+ phages since 2008.
Sea-surface microlayer
The sea-surface microlayer is the uppermost 1–1000 µm layer of the ocean, covering about 70% of Earth's surface and controlling gas and pollutant transfer between sea and atmosphere.
SEA-US
SEA-US, or Southeast Asia–United States Cable System, is a submarine fiber-optic cable connecting Indonesia and the Philippines to Guam, Hawaii, and the US mainland, entering service in 2017.
Sea-Wing (underwater glider)
Sea-Wing (海翼) is a Chinese autonomous underwater glider developed by the Shenyang Institute of Automation, which set a world depth record of 6,329 m in 2017.
Seabed
The seabed, also called the ocean floor or sea floor, is the solid floor of the world ocean, from intertidal flats to hadal trenches deeper than 6,000 m.
Seabed crawler
A seabed crawler is a tracked, bottom-contacting underwater robot that drives across the seafloor on caterpillar tracks, performing work such as cable burial, inspection, excavation, and mineral collection.
Seabed Treaty
The Seabed Treaty is a 1971 arms control agreement banning nuclear weapons and other weapons of mass destruction on the ocean floor beyond a twelve-mile coastal zone.
Seabee
Seabees: U.S. Navy Naval Construction Force, founded 5 March 1942 by Rear Admiral Ben Moreell; motto "We Build, We Fight"; 325,000 WWII tradesmen, 33 Silver Stars; build and defend advance bases.
Seabees
Seabees are the United States Navy's construction troops, organized as Naval Construction Battalions, who build and defend bases and have served from World War II to Iraq and Afghanistan.