{"id":19949,"date":"2026-01-05T12:51:06","date_gmt":"2026-01-05T11:51:06","guid":{"rendered":"https:\/\/www.darda.de\/?page_id=19949"},"modified":"2026-06-02T12:23:02","modified_gmt":"2026-06-02T10:23:02","slug":"immersion-method","status":"publish","type":"page","link":"https:\/\/www.darda.de\/en\/knowledge\/immersion-method","title":{"rendered":"Immersion method"},"content":{"rendered":"
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Immersion method<\/strong> plays a central role in structural hydraulic engineering, in the deconstruction of water-contact structures, and in operations in flooded structures. Whenever concrete, reinforced concrete, natural stone, or steel components must be worked on below the waterline, professional diving operations intersect with hydraulic demolition and cutting technology. Within this field, methods can be selected and combined so that work is carried out safely, precisely, and with minimal impact on the surroundings. Product groups from Darda GmbH such as rock and concrete splitters<\/a>, concrete demolition shears, power units, combi shears, multi cutters, steel shears, and tank cutters are used in practice in a context-specific way, provided the conditions for underwater deployment are met. In addition, interface planning<\/em> between diving teams and hydraulic systems, corrosion control, and robust logistics are decisive for productivity and quality.<\/p>\n

Definition: What is meant by the immersion method?<\/h2>\n

Immersion method<\/strong> denotes the entirety of methods by which professional divers and remotely operated systems (ROV) plan and execute underwater work. This refers to work-related diving operations<\/strong> in construction, deconstruction, and maintenance – not sporting activities. It includes the provision of breathing gas (for example, surface-supplied), the choice of diving mode (such as helmet diving, saturation diving, SCUBA in shallow water), work organization under elevated ambient pressure, and the coordinated use of tools for drilling, splitting, cutting, crushing, and recovery. The aim is a safe, controlled approach in media with restricted visibility, current, cold, and distinctive acoustic conditions. These principles apply in inland and coastal waters, in fresh and salt water, and extend to flooded interiors where confined-space rules and contamination controls are observed.<\/p>\n

Types of diving and work methods in construction and deconstruction<\/h2>\n

Types of diving and work methods depend on depth, duration, accessibility, and the task at hand. In the construction and deconstruction context, the following approaches have become established and can be combined with hydraulic demolition technology when supply, control, and safety are ensured. The selection balances productivity, risk exposure, and environmental constraints.<\/p>\n

Surface-supplied operations (helmet diving)<\/h3>\n

In surface-supplied diving, crews receive breathing gas, communications, and often power through an umbilical. The method is common in heavy underwater operations because it provides stable working conditions, clear lines of command, and the ability to use powerful hydraulic tools. It is applied on pile heads, quay walls, weirs, bridge piers, and lock components. Effective umbilical management, a standby diver, and integrated bailout cylinders enhance resilience during tool-intensive tasks.<\/p>\n

Saturation diving<\/h3>\n

For long deployments at greater depths, the body is \u201csaturated\u201d to an elevated ambient pressure to reduce decompression times. In civil deconstruction this is rare but may be required at deep intakes, tunnel portals, or offshore components. Tool handling and logistics are highly standardized here, with process safety taking precedence. Transfer under pressure, redundant communication, and predefined emergency scenarios are core elements.<\/p>\n

SCUBA in shallow water<\/h3>\n

Open-circuit SCUBA is mainly used for inspection, surveying, marking, and lighter auxiliary tasks. For extensive removal work and high-power applications, surface-supplied methods or working platforms are generally preferred. When SCUBA is used operationally, limited bottom time and tool power call for short, well-defined interventions with clear tending and line control.<\/p>\n

ROV-assisted operations<\/h3>\n

Remotely operated vehicles support tasks in hazardous zones, at low clearances, or where diver access is restricted. Manipulator-compatible hydraulic tools, camera-guided positioning, and tether management enable cleaning, measurement, and preparatory cuts or splits. ROV assistance is often combined with diver oversight and surface-controlled hydraulics.<\/p>\n

Typical underwater work steps<\/h3>\n