Absolute Stealth: Mastering the Acoustic Signature of Submarines

Sound travels through seawater at speeds exceeding 1,500 meters per second, making it the primary detection threat for submarines today. In this high-stakes environment, controlling acoustic signatures is critical to operational success.

Stealth as a Strategic Imperative in Modern Naval Defense

In the naval defense sector, a vessel’s acoustic stealth is just as important as its speed, maneuverability, or maximum diving depth. The ability to operate undetected in sensitive mission zones provides a decisive tactical advantage.

Defense manufacturers and naval forces share a common objective: to measure, manage, and minimize the acoustic signature of submarines.

This is where Akkodis plays a pivotal role. As a trusted partner in advanced defense engineering, Akkodis contributes to large-scale programs focused on developing next-generation submarine technologies. With deep expertise in acoustic signal analysis, data engineering, and end-to-end digital solutions, Akkodis is helping redefine underwater stealth capabilities.

Our goal is to create a digital ecosystem capable of mapping the acoustic footprint of submarines in real time.

Mikaël Marsal, Key Account Manager for Defense and Security at Akkodis, highlights the ambition behind the initiative:

“The objective is to precisely control the noise radiated by the submarine. The system enables accurate localization of each noise source and alerts the crew if operational thresholds are exceeded.”

Real-Time Acoustic Monitoring and Signal Intelligence

A submarine’s acoustic signature is generated by both internal and external noise sources, each contributing to its detectability.

• Internal sources include vibrations from rotating machinery such as electric motors and circulation pumps, transmitted through the vessel’s structure.
• External sources include propeller cavitation, mechanical movement, and hydrodynamic interactions along the hull.

Using advanced sensor networks and AI-driven analytics, these noise sources are continuously monitored and analyzed in real time. This enables precise tracking of acoustic variations and provides actionable insights into the submarine’s operational profile.

By understanding its own acoustic footprint, a submarine gains a critical advantage in potential underwater confrontations, enhancing both stealth and situational awareness.

AI-Driven Platforms for Acoustic Data Analysis and Visualization

At the core of this innovation is Akkodis’ proprietary Datakkod platform, designed to ensure seamless digital continuity from data collection to operational decision-making.

Built on open-source big data architectures and advanced data science frameworks, the platform is enhanced by proprietary Akkodis software libraries that enable secure, scalable, and industrialized data processing.

A key differentiator lies in its human-machine interface (HMI). Designed with real-world military operations in mind, the interface prioritizes clarity, speed, and usability, ensuring that complex data insights are translated into intuitive, actionable outputs.

“The system performs highly complex analyses, but what operators see must remain clear, intuitive, and error-resistant. We have carefully studied operational workflows to design an interface perfectly aligned with user needs.”

From Acoustic Intelligence to Predictive Maintenance

Beyond stealth optimization, the system unlocks powerful capabilities in predictive maintenance and asset performance monitoring.

By cross-analyzing acoustic data, the platform can:

• Detect early signs of equipment wear and degradation
• Identify anomalies in mechanical behavior
• Predict failures before they become critical

Even subtle changes in acoustic patterns can indicate underlying issues, such as worn bearings or malfunctioning machinery, allowing crews to take proactive measures and avoid costly downtime.

This transforms maintenance strategies from reactive to predictive, significantly improving operational efficiency and system reliability.

A Scalable and Transferable Defense Technology Solution

The solution is built on a robust foundation originally developed for the civil industrial sector, leveraging state-of-the-art data architecture and analytics capabilities. This strategic approach enables seamless adaptation to complex naval defense applications.

Deployed across multiple secure Akkodis sites, the platform integrates:

• Advanced software development
• Real-time analytics and reporting
• Secure database segmentation and management

The result is a scalable, high-performance system tailored to the demanding requirements of modern submarine operations.

Shaping the Future of Submarine Stealth Technology

While still in its early stages, the project has already demonstrated strong potential. Both Akkodis and its client have identified key use cases where real-time acoustic intelligence can significantly reduce a vessel’s detectability.

Looking ahead, the ambition is clear: to push the boundaries of underwater stealth and enable submarines to operate with unprecedented levels of acoustic discretion.

“Although we are still in the early phases, our client is confident in the solution and the progress achieved. Our ultimate goal is to help develop the quietest submarines in the world.”