At ThayerMahan, we understand the realities of offshore construction and submarine cable operations. Our advanced maritime technologies deliver critical, real-time data to enable connected, sustainable, safe, and automated projects - from planning through decommissioning.
Our goal: Empower your core business with the right people, technology, and systems, aligned with regulatory guidelines to keep operations safe, efficient, and on schedule.
Our people: A team with deep offshore experience and specialized skills, forged through years of expeditionary operations and a strong, mission-focused military culture of leadership. We are uniquely equipped to solve complex maritime challenges and support defense and security objectives.
Our technology: Cutting-edge, dual-use capabilities - including the sole commercially available coherently beamformed passive acoustic sonar - that improve detection, classification, and monitoring performance across offshore and security missions.
Our systems: Engineered for harsh marine environments to enhance efficiency, safety, and reliability, ensuring robust performance in the most demanding conditions.
Where we operate: Offshore energy and construction sectors - supporting installation, operation, security, and decommissioning of critical maritime infrastructure, including submarine cables.
UXO/MEC Classification & Removal
Keep projects moving - safely and compliantly
Legacy munitions (UXO/MEC) delay progress, increase costs, and introduce significant risk. We transform fragmented stakeholder networks into structured, responsive plans tailored to real-world conditions, enabling safe, regulator-approved progress.
Depth of expertise: Over 500 combined years of UXO subject-matter experience and 30+ veteran EOD operators - including former leaders of U.S. Navy EOD and salvage units and former U.S. Coast Guard Federal On-Scene Commanders.
Full-spectrum operations
Land, surf, and sea - tailored approaches for regulatory and environmental realities:
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Reacquisition: Precision reacquisition of previously detected contacts using advanced platforms (ROVs with magnetometers, tracked surf-zone crawlers) under UXO supervisor control.
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Controlled uncovering & identification: Supervised dredging/uncovering, visual and sonar confirmation, rigorous classification to separate UXO/MEC from benign debris.
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Disposition planning & execution: From relocation ("lift and shift") to coordinated, authorized disposal that meets all safety standards - leveraging partner assets as required.
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Program management: A single, senior ThayerMahan PM integrates vessels, survey/ROV partners, and regulators - so you don't have to coordinate a dozen entities.
Where we operate:
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Offshore construction zones and cable routes
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Surf-zone and shoreline areas
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Ports, harbors, and near-shore infrastructure
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Land-based construction sites and former artillery ranges
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Littoral zones and sensitive marine habitats
Smart, not explosive
Before deflagration - talk to an expert. MEC is not one-size-fits-all. Our expeditionary maritime operators (U.S. EOD backgrounds) bring operational insight and situational awareness to identify the safest, most efficient course of action.
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Conventional approach: Reacquire → submit deflagration requests → wait months for approvals → conduct detonations that trigger further regulatory support and delays.
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ThayerMahan approach: Apply decades of experience to distill thousands of data points into a focused list of actionable targets. Develop non-explosive response plans tailored to project requirements - maintaining regulatory alignment and uninterrupted progress.
Technology & tools: Industry-leading sensors, platforms, and procedures that reduce relocation time and ensure safe, accurate, and efficient operations.
Bottom line: A large volume of ordnance rests on and under the seabed, impacting offshore projects and infrastructure. We detect, classify, and remediate it - safely.
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Next up → Noise Mitigation: Once the seabed is clear, manage construction acoustics to protect marine life and keep permits on track.
Noise Mitigation (Bubble Curtains)
Proven reduction - built for compliance and stewardship
What are bubble curtains? Precisely engineered air-bubble barriers that reduce underwater noise by up to 95% - so underwater construction (and its low-frequency sound) doesn't disturb sensitive or endangered marine species.
Regulators increasingly require noise mitigation, and ocean-using communities expect responsible stewardship. We deliver performance without slowing your schedule.
End-to-end services
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Site-specific engineering
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System design and mobilization
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Onsite deployment and operations by experienced mariners
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Monitoring & Sound Field Verification to prove performance
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Reporting that streamlines closeout and compliance
Operations we support:
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Offshore construction - monopiles, jackets, substructures
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Nearshore infrastructure - quay walls, bridge piers, sheetpiles
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Sensitive asset tests requiring signature masks
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Debris deflection / silt prevention
Your value: More than “checking a box” - it's proven science, regulatory confidence, operational certainty, and environmental stewardship.
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Demonstrated performance
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Confidence with regulators
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Expeditionary operational expertise
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Adaptability across missions
Defense & security context: Noise management supports covert testing and signature control, safeguards environmentally sensitive training areas, and reduces acoustic risk to protected species near national infrastructure.
Next up → Integrated Subsea Monitoring: Extend acoustic awareness with advanced passive sonar to monitor construction zones, cables, and critical infrastructure.
Integrated Flow: From Risk Clearance to Resilient Operations
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Assess & Clear (UXO/MEC) → Remove safety risks and unlock schedules.
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Build & Protect (Noise Mitigation) → Maintain compliance and environmental performance during construction.
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Monitor & Secure (Dual-use Acoustics) → Maintain situational awareness for offshore operations and maritime security.
This integrated sequence reduces risk, accelerates timelines, and improves stakeholder confidence across commercial and defense missions.
Talk to Our Experts
Whether you're early in planning or facing an urgent challenge, our team is ready to help.
Let's discuss your next project or mission.
