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The standard measurement for underwater visibility is the distance at which a Secchi disc can be seen. The range of underwater vision is usually limited by turbidity. In very clear water visibility may extend as far as about 80m, [18] and a record Secchi depth of 79 m has been reported from a coastal polynya of the Eastern Weddell Sea ...
Underwater searches are procedures to find a known or suspected target object or objects in a specified search area under water. They may be carried out underwater by divers, manned submersibles , remotely operated underwater vehicles , or autonomous underwater vehicles , or from the surface by other agents, including surface vessels, aircraft ...
This is a dynamic list and may never be able to satisfy particular standards for completeness. You can help by adding missing items with reliable sources. Most commonly reported shapes in UFO sightings gathered by the National UFO Reporting Center Online Database (NUFORC) This is a list of notable reported sightings of unidentified flying objects (UFOs) and related claims of close encounters ...
An aquascope (also called bathyscope) is an underwater viewing device. It is used to view the underwater world often from dry land or a boat. It eliminates the water surface glare and allows viewing as far as water clarity and light permit. The underwater viewer can be used for observing reefs, checking boat moorings, secchi disks and other ...
Therefore, this was labelled a "UFO Report." The head of the Air Desk then sent another priority telex to the navy headquarters concerning the "UFO Report" and recommended an underwater search be mounted. The navy, in turn, sent another priority telex tasking Fleet Diving Unit Atlantic with carrying out the search.
The underwater environment in flooded caves is a relatively difficult and dangerous environment for exploration. There is a lack of natural light, limited line of sight, a general lack of free surface, and often very restricted space. The water can also be quite deep, and may have a strong flow.
Water surface searches are procedures carried out on or over the surface of a body of water with the purpose of finding lost vessels, persons, or floating objects, which may use one or more of a variety of search patterns depending on the target of the search, as the direction and rate of drift vary depending on the characteristics of the target and the water and weather conditions at the time.
Artemis was considered part of an underwater Defense Early Warning system. However, it was discovered that the Soviet boats were particularly noisy. Rapid advances in computer technology and the development of signal processing algorithms, such as the Fast Fourier transform , quickly gave the West the superior military position using multiple ...