A typical operation involves lowering the seabed tractor onto the seabed over the pipeline when the location has been confirmed. The weight of the tractor remains mostly on the gantry, being controlled by heave-compensation gear on the gantry so that only about 40 tonnes of the weight rests on the seabed. The position reference of the vessel is then transferred to the trim-cube sensors on the seabed tractor support wires, which should remain vertical. The position of the vessel is controlled by the movements of the tractor, with the trim¬cube sensors feeding back wire angle data to the DP [clarification needed] system which corrects the position of the vessel to keep the tractor wires vertical. The DP system would be configured with the centre of rotation located on the trencher. Heading can thus be adjusted according to the environment or any other constraints.[1]
Underwater diving
- Diving activities
- Diving modes
- Atmospheric pressure diving
- Freediving
- Saturation diving
- Scuba diving
- Snorkeling
- Surface oriented diving
- Surface-supplied diving
- Unmanned diving
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Diving equipment |
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Basic equipment | |
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Breathing gas | |
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Buoyancy and trim equipment | |
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Decompression equipment | |
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Diving suit | |
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Helmets and masks | |
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Instrumentation | |
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Mobility equipment | |
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Safety equipment | |
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Underwater breathing apparatus | |
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Diving equipment manufacturers | |
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Access equipment | |
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Breathing gas handling | |
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Decompression equipment | |
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Platforms | |
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Remotely operated underwater vehicles | |
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Safety equipment | |
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General | |
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Activities | |
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Competitions | |
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Equipment | |
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Freedivers | |
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Hazards | |
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Historical | |
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Organisations | |
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Occupations | |
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Underwater work | Salvage diving | - SS Egypt
- Kronan
- La Belle
- SS Laurentic
- RMS Lusitania
- Mars
- Mary Rose
- USS Monitor
- HMS Royal George
- Vasa
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Diving contractors | |
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Tools and equipment | |
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Underwater weapons | |
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Specialties | |
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Diver organisations | |
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Diving tourism industry | |
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Diving events and festivals | |
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Diving hazards | |
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Diving procedures | |
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Risk management | |
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Diving disorders | Pressure related | Oxygen | |
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Inert gases | |
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Carbon dioxide | |
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Breathing gas contaminants | |
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Immersion related | |
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Treatment | |
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Personnel | |
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Screening | |
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Research | Researchers in diving physiology and medicine | |
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Diving medical research organisations | |
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Archeological sites | |
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Underwater art and artists | |
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Engineers and inventors | |
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Historical equipment | |
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Military and covert operations | - Raid on Alexandria (1941)
- Sinking of the Rainbow Warrior
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Scientific projects | |
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Awards and events | |
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Incidents | Dive boat incidents | |
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Diver rescues | |
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Early diving | |
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Freediving fatalities | |
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Offshore diving incidents | - Byford Dolphin diving bell accident
- Drill Master diving accident
- Star Canopus diving accident
- Stena Seaspread diving accident
- Venture One diving accident
- Waage Drill II diving accident
- Wildrake diving accident
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Professional diving fatalities | |
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Scuba diving fatalities | |
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Publications |
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Manuals | - NOAA Diving Manual
- U.S. Navy Diving Manual
- Basic Cave Diving: A Blueprint for Survival
- Underwater Handbook
- Bennett and Elliott's physiology and medicine of diving
- Encyclopedia of Recreational Diving
- The new science of skin and scuba diving
- Professional Diver's Handbook
- Basic Scuba
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Standards and Codes of Practice | |
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General non-fiction | |
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Research | |
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Dive guides | |
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Training and registration |
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Diver training | |
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Recreational scuba certification levels | Core diving skills | |
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Leadership skills | |
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Specialist skills | |
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Diver training certification and registration organisations | Commercial diver certification authorities | |
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Commercial diving schools | |
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Free-diving certification agencies | |
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Recreational scuba certification agencies | |
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Scientific diver certification authorities | |
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Technical diver certification agencies | |
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Military diver training centres | |
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Military diver training courses | |
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Surface snorkeling | |
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Snorkeling/breath-hold | |
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Breath-hold | |
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Open Circuit Scuba | |
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Rebreather | |
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Sports governing organisations and federations | |
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Competitions | |
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Pioneers of diving | |
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Underwater scientists archaeologists and environmentalists | |
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Scuba record holders | |
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Underwater filmmakers and presenters | |
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Underwater photographers | |
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Underwater explorers | |
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Aquanauts | |
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Writers and journalists | |
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Rescuers | |
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Frogmen | |
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Commercial salvors | |
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Diving physics | |
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Diving physiology | |
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Diving environment | |
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Other |
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Deep-submergence vehicle | - Aluminaut
- DSV Alvin
- American submarine NR-1
- Bathyscaphe
- Archimède
- FNRS-2
- FNRS-3
- Harmony class bathyscaphe
- Sea Pole-class bathyscaphe
- Trieste II
- Deepsea Challenger
- Ictineu 3
- JAGO
- Jiaolong
- Konsul-class submersible
- Limiting Factor
- Russian submarine Losharik
- Mir
- Nautile
- Pisces-class deep submergence vehicle
- DSV Sea Cliff
- DSV Shinkai
- DSV Shinkai 2000
- DSV Shinkai 6500
- DSV Turtle
- DSV-5 Nemo
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Submarine rescue | Deep-submergence rescue vehicle | |
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Submarine escape | |
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Special interest groups | |
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Neutral buoyancy facilities for Astronaut training | |
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Other | |
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