UK to acquire $125m submarine acoustic measurement system

The US State Department has approved a potential Foreign Military Sale to the United Kingdom for a High Gain Measurement System (HGS) and associated equipment, valued at an estimated $125 million.

The UK’s request includes the HGS with off-aspect mid-frequency line arrays (MFLAs), acoustic sensors, cables, test hardware and software, anchoring equipment, spare parts, technical documentation, and training.

The package also provides integration and test support, as well as engineering and logistics support services from both the U.S. Government and contractors.

The HGS represents a crucial tool for assessing and improving submarine acoustic signatures, which are vital for maintaining acoustic stealth—a key factor in submarine superiority.

The system allows operators to discriminate between ambient noise and the unique acoustic signatures of submarines, providing data essential for quantifying noise sources, evaluating vulnerability to threat sensors, and improving submarine operations, tactics, and design.

“This sale will support the foreign policy and national security objectives of the United States by improving the security of a key ally that is an important force for political stability and progress in Europe,” the release states.

The UK purchase aligns with the technology installed at the US Navy’s Southeast Alaska Acoustic Measurement Facility (SEAFAC), which uses similar acoustic measurement arrays to assess and maintain the acoustic stealth of US submarines. At SEAFAC, advanced arrays have been used to capture detailed acoustic data for over a decade, providing a benchmark for submarine performance improvements.

Leidos, Inc., headquartered in Reston, West Virginia, will serve as the principal contractor for the UK sale. No offset agreements are anticipated, and the implementation of the sale will not require additional US personnel to be stationed in the UK.

The $125 million figure represents the highest estimated cost, with the final value dependent on requirements, budget authority, and the terms of the sales agreement if finalised. The UK aims to enhance its ability to monitor and optimise the acoustic signatures of its submarine fleet, strengthening capabilities as a key NATO ally and contributor to regional stability.

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