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Underwater Search Techniques. A brief odyssey by Darin Edmunds. About searching underwater…. Considerations. Conditions Hydrology Search Item Equipment Position Area Techniques. Bottom Flat Undulating Sloping. Water Weather Divers. Size Colour Fragility. Ropes Boats Floats. - PowerPoint PPT Presentation
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Underwater Search Underwater Search TechniquesTechniques
A brief odyssey by Darin Edmunds
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About searching underwater…About searching underwater…WaterWeatherDivers
Swim linesCircularTowedSnag lineJackstayGrid
BottomFlatUndulatingSloping
SizeColourFragility
ITVO?GPS coordsTransits
RopesBoatsFloats
Open WaterShoreSize
• ConditionsConditions• HydrologyHydrology• Search ItemSearch Item• EquipmentEquipment• PositionPosition• AreaArea• TechniquesTechniques
Considerations
The Circular SearchThe Circular Search
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Circular Search - SetupCircular Search - Setup• Essential Equipment
Shot line (12-15mm)
Shot Weight (15-25kg)
Buoy (50Kg buoyancy)
• Searches must be 100% Data line/marker
Swim line
Overlapping vision/touch
Techniques
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Semi-circular search
Snag method
Adaptations…Adaptations…
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Unsuitability……Unsuitability……Non-tidal search area30m radius limit*Not suitable for slopes*
Increasing saw tooth profile
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Circular Search… SummaryCircular Search… SummaryTechniques
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The EndThe End
Thank you
