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A dive light is routinely used during night dives and cave dives, when there is little or no natural light, but also has a useful function during the day, as water absorbs the longer (red) wavelengths first then the yellow and green with increasing depth. By using artificial light, it is possible to view an object in full color at greater depths.
The technique also requires that the dive be divided into 5 minute segments, and the total decompression time accumulated for each 5 minute segment be calculated. To add an element of conservatism, divers lump 5 minute segments into pairs, and use the deeper depth of the pair to calculate the amount of decompression time accumulated. [citation ...
Ascending on a decompression buoy while slightly negatively buoyant makes accurate depth and ascent rate control relatively simple, by maintaining light tension on the line as it is reeled in, at the cost of carrying the equipment, a slightly longer time at depth during deployment, a few litres of gas for inflation, and the competence to deploy ...
The PADI recreational dive planner, in "Wheel" format. The Recreational Dive Planner (or RDP) is a decompression table in which no-stop time underwater is calculated. [1] The RDP was developed by DSAT and was the first dive table developed exclusively for no-stop recreational diving. [2]
The intended dive profile is useful as a planning tool as an indication of the risks of decompression sickness and oxygen toxicity for the exposure, to calculate a decompression schedule for the dive, and also for estimating the volume of open-circuit breathing gas needed for a planned dive, as these depend in part upon the depth and duration ...
Depth data may be captured on camera from dive computers or depth gauges carried by the divers or mounted in view of the camera. The photos may be viewed on a map or via a geographic information system (GIS) for analysis. [3] This method can also be used for spatial surveys of small areas, particularly in places where a survey vessel cannot go.
Jacques Cousteau and Albert Falco piloted the subs, [44] which were accompanied by divers to a depth of 100 feet, then continued to a depth of 400 feet, where more toads were observed. After the sub dive the results for the test on the dead fish arrived from Monaco. When trout were introduced into the lake in 1940 parasites were introduced with ...
Limit for surface light penetration sufficient for plant growth in clear water, though some visibility may be possible farther down. [nb 3] 230 m (750 ft) First dive on a hydrox-rebreather (14 February 2023 in the Pearse Resurgence, New Zealand). [21] 290 m (950 ft) Deepest ocean dive on a rebreather (23 March 2014 in Gili Trawangan, Indonesia ...
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