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A mini ROV-based method for recovering marine instruments at depth.

Joseph H Tarnecki¹, William F Patterson¹

¹Fisheries and Aquatic Sciences, University of Florida, Gainesville, Florida, United States of America.

|July 9, 2020

Summary

A new method uses a remotely operated vehicle with a mooring hook for successful seafloor instrument retrieval. This approach offers a reliable and cost-effective solution for deep-sea recovery operations.

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Area of Science:

Marine technology
Oceanographic instrumentation
Robotics in marine science

Background:

Long-term deployment of marine instruments is common.
Retrieval by divers is limited by depth and safety.
Acoustic releases can be expensive and unreliable.

Purpose of the Study:

To present a simple, effective method for retrieving seafloor instruments.
To overcome limitations of current deep-sea retrieval techniques.

Main Methods:

Integration of a commercial mooring hook with a mini remotely operated vehicle (ROV).
ROV attaches lines to seafloor instruments for surface retrieval via winch.
Apparatus tested in pools and deployed in the Gulf of Mexico.

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Seawater Sampling and Collection

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Published on: June 17, 2009

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Main Results:

Successfully retrieved acoustic telemetry receiver bases (50 kg) and fish traps (30-50 kg).
Operations conducted at depths of 28-80 meters on the continental shelf.
Achieved a 100% success rate over 539 retrievals (239 receiver bases, 300 fish traps) in 30 sea days (2013-2019).

Conclusions:

The described method provides a reliable and cost-effective alternative for deep-sea instrument retrieval.
This technique can be applied to various instruments and salvage operations beyond standard diving limits.