Underwater search and recovery

Underwater Search and Recovery

Nesconset FD Scuba rescue team preparing for a mission.

Underwater search and recovery is the process of locating and retrieving objects or bodies from underwater environments. This task is often performed by specialized diving teams, which may include public safety divers, commercial divers, or military divers. The operations can be complex and require a combination of skills, equipment, and techniques to ensure success and safety.

Techniques and Equipment

Underwater search and recovery operations utilize a variety of techniques and equipment to locate and retrieve objects. The choice of method depends on factors such as the size and type of the object, water conditions, and the environment.

Search Patterns

Diagram of a circular search pattern.

Search patterns are systematic methods used to cover a search area efficiently. Common patterns include:

• Circular Search Pattern: Used when the search area is small and the object is likely to be near a known point.
• Grid Search Pattern: Suitable for larger areas, where divers swim in straight lines back and forth across the search area.
• Jackstay Search Pattern: Involves a line laid on the bottom, with divers searching along it.

Equipment

Training with a hand-held sonar.

Various equipment is used to aid in underwater search and recovery:

• Sonar Devices: Hand-held sonar and side-scan sonar are used to detect objects underwater.
• Lifting Bags: Used to raise heavy objects to the surface by attaching them to the object and inflating the bag.

Example of a lifting bag used in recovery operations.

• Underwater Metal Detectors: Useful for locating metallic objects.
• Cameras and Video Equipment: Allow divers to document the search area and objects found.

Types of Operations

Underwater search and recovery operations can be categorized based on the nature of the object being recovered:

• Body Recovery: Involves locating and retrieving human remains, often in collaboration with law enforcement agencies.
• Evidence Recovery: Searching for and recovering evidence related to criminal investigations.
• Salvage Operations: Retrieving valuable objects or cargo from sunken vessels.
• Environmental Cleanup: Removing debris and pollutants from underwater environments.

Challenges

Underwater search and recovery operations face numerous challenges, including:

• Visibility: Poor visibility can hinder search efforts and increase the risk to divers.
• Currents and Tides: Strong currents can make it difficult to maintain position and control during a search.
• Depth and Pressure: Deeper dives require specialized equipment and training to manage the increased pressure.
• Hazardous Environments: Contaminated water or dangerous wildlife can pose additional risks.

Training and Safety

Team preparing for a dive.

Proper training is essential for divers involved in search and recovery operations. Training programs cover:

• Diving Skills: Advanced diving techniques and equipment handling.
• Search Techniques: Instruction on various search patterns and equipment use.
• Safety Protocols: Emphasis on safety procedures and emergency response.

Related Pages

• Diving
• Sonar
• Salvage
• Public Safety Diving