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Process of harvesting trees that are submerged under water
Underwater logging is the process of logging trees from underwater forests. When artificial reservoirs and dams are built, large areas of forest are often
Underwater_logging
Process of cutting, processing, and moving trees
or logging railroad Logging road Heli-logging Log driving Log scaler Lumberjack Lumberjack World Championship World Logging Championship Logging camp
Logging
Topics referred to by the same term
air from an archeological site by groundwater, preserving artifacts Underwater logging, the process of harvesting trees that are submerged under water Watered
Waterlogging
Australian conservationist (1962–2006)
2006, Irwin died from an injury caused by a stingray while filming an underwater documentary in the Great Barrier Reef. His death became international
Steve_Irwin
Special forces unit of the Royal Navy
minutes Swim 50 metres clothed with a weapon and belt Swim 25 metres underwater while holding your breath Multiple canoe trials including: Carrying a
Special_Boat_Service
U.S. Navy's special operations force
component within Underwater Demolition Units ONE and TWO...", the new SEAL Teams would be formed entirely of personnel transferred from Underwater Demolition
United_States_Navy_SEALs
US Navy special operations group
The Underwater Demolition Team (UDT), or frogmen, were amphibious units created by the United States Navy during World War II with specialized missions
Underwater_Demolition_Team
Firearms that can be effectively fired underwater
An underwater firearm is a firearm designed for use underwater. Underwater firearms or needleguns usually fire flechettes or spear-like bolts instead
Underwater_firearm
Descending below the surface of the water to interact with the environment
Underwater diving, as a human activity, is the practice of descending below the water's surface to interact with the environment. It is also often referred
Underwater_diving
Semi-submersible offshore drilling rig
The incident cost the company millions of US dollars in lost income. Underwater diving portal Commercial offshore diving – Professional diving in support
Byford_Dolphin
Human habitable underwater enclosure filled with breathable gas
Underwater habitats are a form of subsea technology. They are underwater structures in which people can live for extended periods and carry out most of
Underwater_habitat
Soviet underwater assault firearm firing unrifled steel flechettes
The APS underwater assault rifle (Russian: Автомат Подводный Специальный, romanized: Avtomat Podvodny Spetsialnyy, lit. 'Special Underwater Assault Rifle')
APS_underwater_rifle
USMC deep reconnaissance unit
first—along with the early Navy Combat Demolition Units (the predecessor to the Underwater Demolition Teams [i.e., the Navy SEALs])—to embark from submarines; most
United States Marine Corps Force Reconnaissance
United_States_Marine_Corps_Force_Reconnaissance
English broadcaster and natural historian (born 1926)
110–113. doi:10.1038/sj.embor.7400340. PMC 1299250. PMID 15689937. "Cook's Log v27 no. 4" (PDF). Archived (PDF) from the original on 30 August 2021. Retrieved
David_Attenborough
2018 international rescue mission in Thailand
options for extracting the group, including whether to teach them basic underwater diving skills to enable the earliest possible rescue, to wait until a
Tham_Luang_cave_rescue
Diving incident in the Maldives
the liveaboard vessel MV Duke of York. The dive took place in a deep underwater cave environment at depths which exceeded standard recreational diving
2026 Dhekunu Kandu cave diving incident
2026_Dhekunu_Kandu_cave_diving_incident
Organ system for circulating blood in animals
Nondestructive testing Underwater logging Underwater photography Underwater search and recovery Underwater searches Underwater videography Underwater survey Salvage
Circulatory_system
Severely deficient supply of oxygen
being in environments where oxygen is not readily accessible: such as underwater, in a low oxygen atmosphere, or in a vacuum; environments where sufficiently
Asphyxia
Study of human activity via evidence found underwater
Underwater archaeology is archaeology practiced underwater. As with all other branches of archaeology, it evolved from its roots in pre-history and in
Underwater_archaeology
Human body core temperature below 35 °C (95 °F)
Nondestructive testing Underwater logging Underwater photography Underwater search and recovery Underwater searches Underwater videography Underwater survey Salvage
Hypothermia
Outcrop of rock in the sea formed by the growth and deposit of stony coral skeletons
A coral reef is an underwater ecosystem characterized by reef-building corals. Reefs are formed of colonies of coral polyps held together by calcium carbonate
Coral_reef
Disorder caused by dissolved gases forming bubbles in tissues
most commonly occurs during or soon after a decompression ascent from underwater diving, but can also result from other causes of depressurization, such
Decompression_sickness
Tethered underwater mobile device operated by a remote crew
remotely operated underwater vehicle (ROUV) or remotely operated vehicle (ROV) is a free-swimming submersible craft. ROVs are underwater machines that are
Remotely operated underwater vehicle
Remotely_operated_underwater_vehicle
Irish safety freediver (1977-2017)
ISSN 0029-7712. Retrieved 2023-10-27. Blake, Meredith (2023-07-24). "In the underwater tragedy of Netflix's 'Deepest Breath,' the appeal of the deep explained"
Stephen_Keenan
Special forces unit of the British Army
Nondestructive testing Underwater logging Underwater photography Underwater search and recovery Underwater searches Underwater videography Underwater survey Salvage
Special_Air_Service
Perception of one's environment
In-flight visual impairment by pilots Diving safety – Risk management of underwater diving activities Information integration – Cohesive synthesis of information
Situation_awareness
Aquatic or submarine environment
An underwater environment is an environment of, and immersed in, liquid water in a natural or artificial feature (called a body of water), such as an ocean
Underwater_environment
British ocean liner (1907–1915)
contracted by Bemis to conduct the survey. The Department of the Environment's Underwater Archaeology Unit was to join the survey team to ensure that research would
RMS_Lusitania
British science fiction writer (1917–2008)
to pursue his interest in scuba diving. That year, he discovered the underwater ruins of the ancient original Koneswaram Temple in Trincomalee. Clarke
Arthur_C._Clarke
U.S. Navy officer and NASA astronaut (born 1965)
June 1998 when she was selected by NASA for the astronaut program. She has logged more than 3,000 flight hours in more than 30 aircraft types. Williams retired
Sunita_Williams
US government scientific agency
Nondestructive testing Underwater logging Underwater photography Underwater search and recovery Underwater searches Underwater videography Underwater survey Salvage
National Oceanic and Atmospheric Administration
National_Oceanic_and_Atmospheric_Administration
Medical condition of lack of oxygen in the tissues
inappropriate mixtures of gases with a low oxygen content, e.g., while diving underwater, especially when using malfunctioning closed-circuit rebreather systems
Hypoxia_(medicine)
Pirate Blackbeard's ship
expected with a colonial pirate crew. For one week in 2000 and 2001, live underwater video of the project was webcast to the Internet as a part of the QAR
Queen_Anne's_Revenge
Metalworking techniques used by underwater divers
Underwater cutting and welding are metalworking techniques used by underwater divers in underwater construction, marine salvage and clearance diving applications
Underwater cutting and welding
Underwater_cutting_and_welding
Ability to see objects underwater
Underwater vision is the ability to see objects underwater, and this is significantly affected by several factors. Underwater, objects are less visible
Underwater_vision
Underwater sport of pushing a puck into the opposing goal
Underwater hockey (UWH), also known as Octopush in the United Kingdom, is a limited-contact sport in which two teams compete to manoeuvre a puck across
Underwater_hockey
Change in sea level due to gravity
from the Moon's position in the sky. Coastal characteristics such as underwater bathymetry and coastline shape mean that individual location characteristics
Tide
French oceanographer and author (1910–1997)
self-contained underwater breathing apparatus (SCUBA), called the Aqua-Lung, which assisted him in producing some of the first underwater documentaries
Jacques_Cousteau
German filmmaker (1902–2003)
Tiefland in 1954, her work as a photographer, her autobiography in 1987, underwater photographs and two photo books on the Nuba peoples of southern Sudan
Leni_Riefenstahl
Italian freediver (born 1992)
Championship in Ischia, organised by the Italian Federation of Sport Fishing and Underwater Activities, she won three gold medals with relative world records: in
Alessia_Zecchini
Field concerned with the safety, health and welfare of people at work
Nondestructive testing Underwater logging Underwater photography Underwater search and recovery Underwater searches Underwater videography Underwater survey Salvage
Occupational safety and health
Occupational_safety_and_health
Crewed full ocean depth rated submersible
species of marine animals" and "some sort of plastic waste". Among the underwater creatures Vescovo encountered were a snailfish at 26,250 ft (8,000 m)
DSV_Limiting_Factor
Genre of photography
Underwater photography is the practice of capturing images beneath the surface of the water, often done while scuba diving, but can also be done while
Underwater_photography
Developments over time in the human activity
The history of underwater diving starts with freediving as a widespread means of hunting and gathering, both for food and other valuable resources such
History_of_underwater_diving
Equipment designed to help protect an individual from hazards
stingers. Diving equipment, for underwater diving, constitutes equipment such as a diving helmet or diving mask, an underwater breathing apparatus, and a diving
Personal_protective_equipment
Study of the propagation of sound in water
Underwater acoustics (also known as hydroacoustics) is the study of the propagation of sound in water and the interaction of the mechanical waves that
Underwater_acoustics
Diving in water-filled caves
Cave diving is underwater diving in water-filled caves. It may be done as an extreme sport, a way of exploring flooded caves for scientific investigation
Cave_diving
Techniques requiring specific equipment and procedures
A mode of diving, or diving mode, is a particular way to dive underwater that requires specific equipment, procedures and techniques, and may expose the
Modes_of_underwater_diving
Type of US Army Special Forces combat operations
Special Forces Underwater Operations (SFUWO) is the term for United States Army Special Forces combat operations involving the use of underwater infiltration
Special Forces Underwater Operations
Special_Forces_Underwater_Operations
Chamber for transporting divers vertically through the water
to depth and back in open water, usually for the purpose of performing underwater work. The most common types are the open-bottomed wet bell and the closed
Diving_bell
jargon, diver slang and acronyms used in underwater diving. The definitions listed are in the context of underwater diving. There may be other meanings in
Glossary of underwater diving terminology: A–C
Glossary_of_underwater_diving_terminology:_A–C
Device measuring a ship's speed
Scientific Medical & Mechanical Antiques. Retrieved 2006-08-26. "Submarine Underwater Log Systems, NAVPERS 16168". Standards and Curriculum Division, Training
Pitometer_log
Soviet four-barreled underwater dart pistol
The SPP-1 underwater pistol was made in the Soviet Union for use by Soviet frogmen as an underwater firearm. It was developed in the late 1960s and accepted
SPP-1_underwater_pistol
Directional mass flow of oceanic water
Nondestructive testing Underwater logging Underwater photography Underwater search and recovery Underwater searches Underwater videography Underwater survey Salvage
Ocean_current
Underwater team sport
Underwater rugby is an underwater team sport in which two teams compete to deliver a negatively buoyant ball into the opponents' goal at the bottom of
Underwater_rugby
Wireless technique of sending and receiving messages through water
Underwater acoustic communication is a technique of sending and receiving messages in water. There are several ways of employing such communication but
Underwater acoustic communication
Underwater_acoustic_communication
Welding metal at elevated pressure
welding is the process of extreme welding at elevated pressures, normally underwater. Hyperbaric welding can either take place wet in the water itself or dry
Hyperbaric_welding
American engineer, astronaut, and naval aviator (born 1964)
Kelly served as the commander of the NEEMO 4 mission aboard the Aquarius underwater laboratory, 4 mi offshore from Key Largo. The NEEMO 4 crew spent five
Scott_Kelly_(astronaut)
Submersible that traveled to the Challenger Deep
data, and sent it to the support ship at three-minute intervals via an underwater acoustic communication system developed by West Australian company L-3
Deepsea_Challenger
Emergency first response medical treatment
circumstantial safety needs. Hyperbaric first aid may be practiced by underwater diving professionals, who need to treat conditions such as decompression
First_aid
American astronaut, circled the Moon in 2026 (born 1975)
Nondestructive testing Underwater logging Underwater photography Underwater search and recovery Underwater searches Underwater videography Underwater survey Salvage
Reid_Wiseman
American engineer, vintner, and former NASA astronaut
during the NEEMO 12 mission aboard the Aquarius underwater laboratory, living and working underwater for eleven days. Hernández worked various technical
José_M._Hernández
Underwater firearm developed by the United States during the Cold War
The M1 Underwater Defense Gun, also called the Underwater Defense Gun Mark 1 Mod 0, is an underwater firearm developed by the United States during the
Mk_1_Underwater_Defense_Gun
Acoustic sensing method
navigation and ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, measure distances (ranging)
Sonar
Polish special forces unit
Nondestructive testing Underwater logging Underwater photography Underwater search and recovery Underwater searches Underwater videography Underwater survey Salvage
GROM_Military_Unit
Italian shark diver and conservationist
and working with sharks in 1995. The same year, she began working for Underwater Explorer's Society (UNEXSO). Later, she became both a PADI Course Director
Cristina_Zenato
Austrian freediver and world record holder
neckweight allowed him to swim more horizontally and hydrodynamically underwater compared to a weight belt around the waist. Tom Sietas beat Nitsch's last
Herbert_Nitsch
2006 animal encounter accident
Reef, near Port Douglas, Queensland, taking part in the production of an underwater documentary Ocean's Deadliest. During a lull in filming caused by inclement
Death_of_Steve_Irwin
Russian bullpup assault rifle for combat divers
units were armed with special weapons for underwater combat, including the SPP-1 pistol and APS underwater assault rifle. The main drawback of these weapons
ADS_amphibious_rifle
Portable apparatus to recycle breathing gas
military operations by frogmen, as well as for undisturbed observation of underwater wildlife. A rebreather is generally understood to be a portable apparatus
Rebreather
Inspection or measurement in or of an underwater environment
An underwater survey is a survey performed in an underwater environment or conducted remotely on an underwater object or region. Surveys can have several
Underwater_survey
Set of detailed instructions to assist in workplace safety
Nondestructive testing Underwater logging Underwater photography Underwater search and recovery Underwater searches Underwater videography Underwater survey Salvage
Standard_operating_procedure
Swimming while inhaling through a snorkel
of the underwater sport of finswimming. Snorkeling is also used by scuba divers when at the surface, in underwater sports such as underwater hockey and
Snorkeling
Underwater diving without breathing apparatus
techniques, spearfishing, underwater photography, synchronised swimming, underwater football, underwater rugby, underwater hockey, underwater target shooting and
Freediving
Anglo-Irish scientist (1627–1691)
"The diving "Law-ers": A brief resume of their lives". South Pacific Underwater Medicine Society Journal. 29 (1). ISSN 0813-1988. OCLC 16986801. Archived
Robert_Boyle
Water current moving away from shore
shore, where breaking waves approach the shore parallel to it, or where underwater topography encourages outflow at one specific area. Baïnes are one of
Rip_current
English Tudor warship (1511–1545)
breadth ratio was accompanied by fine lines, particularly in the run (the underwater hull shape abaft the midship section). Even in the full sections in the
Mary_Rose
Swimming underwater, breathing gas carried by the diver
Scuba diving is an underwater diving mode where divers use breathing equipment completely independent of a surface breathing gas supply, and therefore
Scuba_diving
Equipment which provides breathing gas to an underwater diver
Underwater breathing apparatus is equipment which allows the user to breathe underwater. The three major categories of ambient pressure underwater breathing
Underwater breathing apparatus
Underwater_breathing_apparatus
Tactical scuba diver
A frogman is someone who is trained in scuba diving or swimming underwater. The term often applies more to professional rather than recreational divers
Frogman
Underwater habitat off Key Largo in the Florida Keys National Marine Sanctuary
The Aquarius Reef Base is an underwater habitat located 5.4 mi (8.7 km) off Key Largo in the Florida Keys National Marine Sanctuary, Florida, United States
Aquarius_Reef_Base
International event for the sport of Underwater Hockey
The Underwater Hockey World Championship is the peak international event for the underwater sport of Underwater Hockey. The event is conducted on behalf
Underwater Hockey World Championships
Underwater_Hockey_World_Championships
Competitive underwater recreational activities
underwater football, underwater hockey, underwater ice hockey, underwater orienteering, underwater photography, underwater rugby, underwater target shooting
Underwater_sports
Treaty adopted on 2 November 2001
The Convention on the Protection of the Underwater Cultural Heritage is a treaty that was adopted on 2 November 2001 by the General Conference of the United
Convention on the Protection of the Underwater Cultural Heritage
Convention_on_the_Protection_of_the_Underwater_Cultural_Heritage
Equipment used to facilitate underwater diving
Diving equipment, or underwater diving equipment, is equipment used by underwater divers to make diving activities possible, easier, safer and/or more
Diving_equipment
Unplanned drop in the pressure of a sealed system
Nondestructive testing Underwater logging Underwater photography Underwater search and recovery Underwater searches Underwater videography Underwater survey Salvage
Uncontrolled_decompression
Indian Navy special operations force
trained for sabotage missions. The combat divers had also taught basic underwater demolition training to Muktibahinis (Freedom Fighters) from Bangladesh
MARCOS
American marine biologist and lecturer
of study for up to several weeks. Although she had logged more than 1,000 research hours underwater, Earle was rejected from the program. The next year
Sylvia_Earle
Influences of the underwater environment on the physiology of human divers
Human physiology of underwater diving is the physiological influences of the underwater environment on the human ambient pressure diver, and adaptations
Human physiology of underwater diving
Human_physiology_of_underwater_diving
Canadian astronaut, circled the Moon in 2026 (born 1976)
NEEMO 19 undersea exploration mission as an aquanaut aboard the Aquarius underwater laboratory. The mission began on September 7, 2014, and lasted seven days
Jeremy_Hansen
Respiratory impairment caused by submersion in liquid
recommended for a person whose heart has stopped beating and has been underwater for less than an hour. A major contributor to drowning is the inability
Drowning
Alphabetical listing of underwater diving related topics
The following index is provided as an overview of and topical guide to underwater diving: Links to articles and redirects to sections of articles which
Index_of_underwater_diving:_S
Facility for supporting saturation diving projects
equipment required to support a saturation diving operation. It may be an underwater habitat, or more commonly for commercial diving operations, a hyperbaric
Saturation_diving_system
Techniques for finding underwater targets
They may be carried out underwater by divers, manned submersibles, remotely operated underwater vehicles, or autonomous underwater vehicles, or from the
Underwater_searches
Tabulated data to facilitate safe diving ascents
Physiological basis for decompression theory and practice Underwater habitat – Human habitable underwater enclosure filled with breathable gas Work in compressed
Decompression_tables
Chronological list of notable events in the history of underwater diving equipment
The timeline of underwater diving technology is a chronological list of notable events in the history of the development of underwater diving equipment
Timeline_of_diving_technology
Technique for equalising pressure in the middle ears
antral communication. When rapid ambient pressure increase occurs, as in underwater diving or aircraft descent, this pressure tends to hold the eustachian
Valsalva_maneuver
American novelist and underwater explorer (1931–2020)
15, 1931 – February 24, 2020) was an American adventure novelist and underwater explorer. His thriller novels, many featuring the character Dirk Pitt
Clive_Cussler
Physiological responses to immersion of air-breathing vertebrates
Children tend to survive longer than adults when deprived of oxygen underwater. The exact mechanism for this effect has been debated and may be a result
Diving_reflex
Female divers of Jeju, South Korea
TV series); a Japanese immigrant trains to become a haenyeo. Breathing Underwater – 2016 documentary on haenyeo directed by Koh Heeyoung. Canola – 2016
Haenyeo
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