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Autonomous Systems: Land & Sea
24JUN

US prime digs into UK seabed war

4 min read
16:13UTC

At the Combined Naval Event from 19 to 21 May, HII highlighted separate Babcock collaborations on underwater launch and recovery and ARMOR Force's ROMULUS surface vessels.

TechnologyDeveloping
Key takeaway

HII and Babcock are collaborating on submarine-drone launch and recovery, separately from ARMOR Force's proposed surface vessels.

At the Combined Naval Event from 19 to 21 May in Farnborough, HII showcased REMUS underwater vehicles and ROMULUS surface vessels. Its announcement described separate underwater and surface collaborations with Babcock.⁠1 An uncrewed underwater vehicle (UUV) is a submarine-shaped robot that runs without a crew, used to hunt mines, inspect seabed cables, and scout ahead of manned ships. HII said it has delivered more than 750 REMUS UUVs to over 30 countries, and that a REMUS 600 was launched and recovered through the torpedo tube of the submarine USS Delaware. That manoeuvre lets a submerged boat send a robot ahead to scout or hunt mines without surfacing.

Babcock and HII are working on submarine torpedo-tube launch and recovery of underwater vehicles. Separately, ARMOR Force (Autonomous and Remote, Maritime Operational Response) incorporates HII's ROMULUS surface vessels into a proposed future Royal Navy fleet. HII has also enlarged its Portchester facility in Hampshire as a European hub for allied navies. These announcements describe industrial collaboration and a support facility; they do not establish a Royal Navy procurement contract.

L3Harris said on 27 May its sub-launched Iver4 900 underwater vehicle is in delivery to the US Navy under a Defense Innovation Unit contract, a marker of how fast torpedo-tube-launched robots are reaching the fleet.⁠2 Both HII and L3Harris demonstrated the launch-and-recovery trick within the same window. For European navies the read is procurement urgency, since seabed cables and pipelines now sit inside the threat picture and the robots to defend them are arriving from American primes first.

Deep Analysis

In plain English

HII's REMUS family comprises underwater robots used for tasks including mine detection, intelligence gathering and seabed surveys. A REMUS 600 has been launched and recovered through a submarine torpedo tube. The parent submarine stays hidden while its robot scouts ahead, which is why navies pay large sums for this capability. At a UK naval conference in May, HII showcased REMUS underwater robots and ROMULUS surface vessels. It described Babcock collaboration on underwater launch and recovery separately from ARMOR Force's surface-vessel plans. HII has delivered over 750 REMUS underwater vehicles to more than 30 countries. A separate US company, L3Harris, also announced its Iver4 900 torpedo-launched robot is now being delivered to the US Navy. Both pitches are part of a push by US firms to supply the UK and European navies as demand for underwater surveillance rises.

Deep Analysis
Root Causes

The Royal Navy's receptiveness to US-origin subsea autonomy has one primary structural driver: the decommissioning of the UK's dedicated mine countermeasures and hydrographic capability at a pace that outstrips domestic procurement.

When the Batch 1 River-class offshore patrol vessels were sold, and as the Hunt and Sandown mine hunter fleets age, the gap between what the Royal Navy needs to do and what its own hulls can deliver has widened. ARMOR Force's ROMULUS vessels operate on the surface. The separate Babcock-HII underwater collaboration concerns launch and recovery through submarine torpedo tubes.

For HII, the strategic logic is market consolidation ahead of an expected NATO-wide increase in UUV procurement following the Red Sea cable-cutting incidents of 2023-24 and Baltic seabed infrastructure attacks. HII's European support hub expands its presence, but whether the Royal Navy adopts REMUS 600 for torpedo-tube operations remains a future procurement question; the cited announcement does not establish such a fleet.

What could happen next?
  • Consequence

    HII's Portchester European hub and Babcock partnership create a US-origin UUV supply chain embedded in UK sovereign infrastructure, making future Royal Navy procurement of competing European platforms structurally harder.

    Medium term · Assessed
  • Risk

    French and German AUV manufacturers face a narrowing window to establish equivalent reference sales with a NATO tier-one navy before US-origin platforms set the interoperability standard for Allied submarine-launched UUV operations.

    Short term · Suggested
  • Precedent

    USS Delaware's torpedo-tube REMUS 600 demonstration is the first publicly confirmed instance of a UK-allied navy certifying a US UUV for submarine-tube launch, establishing a technical baseline for joint Allied subsea operations.

    Immediate · Assessed
First Reported In

Update #1 · UK's robot navy sails for Hormuz

Naval News· 29 May 2026
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Written with AI from Lowdown's published reporting. Not individually reviewed by an editor. Editorial standards.