Intervention AUV

Lore & Background

Before I-AUVs, basic maintenance and repairs on subsea installations were performed by human divers in pressure-resistant suits, operations that were highly dependent on weather and posed direct hazards. As shallow oil sources depleted, wells were installed deeper than 500 meters, making diver operations less feasible due to heavy suits and increased risks. Beginning in the 1980s, ROVs gradually took over these duties, becoming a proven tool. Both diver and ROV methods require mobilization of a surface support vessel, with daily costs in the hundreds of thousands of USD, significantly contributing to operational expenses.

The concept of I-AUVs emerged after AUVs reached commercial maturity, initially used by hydrographic, fishing, and oil exploration businesses for survey tasks like bottom mapping. Advances in computational power, underwater navigation systems (such as ultra-short baseline and sonar), acoustic modems, and cameras enabled vehicles to achieve precise positioning and control for intervention missions. A manipulator is attached to the AUV, creating an underwater vehicle-manipulator system. Missions include manipulating valves on an oilfield Christmas tree or retrieving biological specimens from the seafloor for scientific study.

Future developments anticipate ROVs, AUVs, and related underwater robots achieving human diver equivalent capabilities, including human-like grasping and multi-degree-of-freedom manipulators with various end effectors for tasks like construction, salvage, rescue, and repair. Coordination of multiple AUVs for complex tasks is also expected, as exemplified by the TWINBOT project.

Reader's Guide

The significance of the Intervention AUV lies in its potential to reduce the high operational costs and risks associated with traditional subsea intervention methods. By eliminating the need for a surface support vessel for diver or ROV operations—which can cost hundreds of thousands of USD per day—I-AUVs offer a more autonomous and cost-effective alternative. Their development builds on advances in computational power, navigation systems, and acoustic modems, enabling precise control and environmental reasoning. The addition of a manipulator allows these vehicles to perform tasks such as valve manipulation on oilfield Christmas trees and biological specimen retrieval, expanding the scope of autonomous underwater operations. The legacy of I-AUVs is evident in projects like the 1996 OTTER I-AUV, the 2003 ALIVe AUV, and the 2018 TWINBOT project, which demonstrate ongoing research into coordinated multi-vehicle systems. Future capabilities are expected to include human-like grasping and multi-degree-of-freedom manipulators for construction, salvage, rescue, and repair, potentially transforming underwater intervention by reducing reliance on human divers and surface vessels.

Did You Know?

• I-AUVs are capable of autonomous interventions on subsea installations, a task usually done by ROVs or human divers.
• The daily cost of operating a surface support vessel for diver or ROV intervention can be hundreds of thousands of USD.
• The 2008 Nessie AUV by Heriot-Watt University won the SAUC-E competition twice.
• The TWINBOT project involves coordination of several AUVs for complex tasks.