“Ticking Bombs Below”: New Sonar Tech Deployed to Hunt Buried WWII Explosives Lurking in U.S. Coastal Waters for Decades

As military sites across the United States transition from restricted zones to areas open for civilian use, the legacy of past conflicts lingers beneath the surface. Buried in the depths of these waters are unexploded ordnance (UXO)—bombs and munitions from as far back as World War II that never detonated. These relics of war pose a significant threat, especially in shallow waters now frequented by the public. Recent technological advancements in sonar detection, led by researchers like Connor Hodges from the University of Texas at Austin, are crucial for mitigating these dangers and ensuring public safety.

Understanding the Threat of Underwater UXOs

Unexploded ordnance can lie dormant for decades, appearing harmless until disturbed by unsuspecting individuals or marine activities. When triggered, these devices can still detonate, leading to catastrophic consequences. Traditional sonar systems, which rely on detecting shapes and materials, struggle to identify UXOs as they corrode and blend into their surroundings. The weakened acoustic signals returned by these aged munitions increase the risk of false negatives during detection surveys, missing potentially dangerous UXOs.

Connor Hodges and his team at the University of Texas are at the forefront of research aimed at improving sonar detection of UXOs. By studying the acoustic signatures of degraded munitions, the team seeks to understand how factors like corrosion and encrustation affect sonar readings. Their work with AN-Mk 23 practice bombs, submerged for over 80 years, has revealed that degradation significantly alters an object’s acoustic resonance, complicating detection efforts.

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The Role of Acoustic Scattering in Detection

Acoustic scattering techniques play a crucial role in identifying underwater UXOs. These techniques provide insights into the internal structure of objects beneath the seafloor, offering a way to “see” beyond the surface. However, as Hodges emphasizes, the interaction of old munitions with sonar technology is increasingly important as military sites are repurposed for civilian use.

With over 400 contaminated sites across the U.S., the need for effective UXO detection is urgent. The work conducted by Hodges’ team is an essential step in ensuring that these areas can be safely transitioned for public access. By improving understanding of how these munitions degrade and interact with sonar, researchers can develop more reliable detection models, crucial for both public safety and environmental remediation.

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Future Directions in UXO Research

Looking ahead, Connor Hodges plans to broaden his research to encompass a wider variety of munitions and different environmental conditions. By exploring diverse corrosion and encrustation scenarios, Hodges aims to create comprehensive models that enhance the reliability of sonar-based UXO detection. These models are not only vital for military operations but also for environmental and humanitarian missions.

As Hodges notes, “Underwater UXO can be tricky to find and recover, so it is important that this can be done safely and effectively. We hope this work will ultimately help save lives.” His research, presented at the joint meeting of the Acoustical Society of America and the International Congress on Acoustics, underscores the critical importance of advancing sonar technology in safeguarding our oceans and communities.

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Implications for Public Safety and Environmental Health

The transition of military sites to civilian use is a growing trend across the United States. However, the presence of UXOs poses a substantial risk to both public safety and environmental health. As these areas open to the public, the potential for accidental detonation increases, making effective detection and remediation strategies imperative.

The work of researchers like Connor Hodges is pivotal in addressing these challenges. By enhancing our ability to detect and recover UXOs, we can prevent accidents, protect lives, and preserve the environment. As we continue to navigate the legacy of past conflicts, how can we further harness technology to ensure that our waters remain safe and accessible for all?