Iver4 900
L3Harris Iver4 900-series autonomous underwater vehicle designed for clandestine torpedo-tube launch and recovery from attack submarines; in delivery to the US Navy from May 2026.
L3Harris's submarine-launched Iver4 900 entered delivery to the US Navy in May 2026 and was named, on 30 May, one of two American platforms anchoring AUKUS's first Pillar II Signature Project, alongside the Mission Specialist Defender Mk IV.
Last refreshed: 24 July 2026 · Appears in 1 active topic
How fast are submarine-launched AUVs like Iver4 900 reaching frontline US Navy boats?
Timeline for Iver4 900
Named as one of two UUV platforms in the AUKUS Pillar II fact sheet
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Autonomous Systems: Land & SeaBackground
The Iver4 900 is a submarine-launched autonomous underwater vehicle (AUV) built by L3Harris for clandestine intelligence-gathering, mine countermeasures and hydrographic survey. Its defining feature is size: it is built to fit standard 533mm torpedo tubes, letting Virginia-class and other attack submarines launch and recover it without surface support.
That form factor is the point. Torpedo-tube launch means an attack submarine can deploy a survey or reconnaissance asset forward, near contested seabed infrastructure, without exposing a crewed hull or a surface vessel to detection. The vehicle runs pre-programmed missions autonomously and with a low acoustic signature, prioritising extended, unsupported range over real-time operator control.
The vehicle reached the US Navy through the Defense Innovation Unit, the Pentagon's fast-track acquisition Arm for commercial technology, a route increasingly used to move autonomous maritime systems from prototype to fleet faster than conventional procurement allows.
Iver4 900 anchors AUKUS's undersea pact
L3Harris confirmed in May 2026 that the Iver4 900 was in delivery to the US Navy under a Defense Innovation Unit contract, moving the torpedo-tube-launched vehicle from development into fleet service. On 30 May, AUKUS named it, alongside the Mission Specialist Defender Mk IV, as one of two platforms in the pact's first Pillar II Signature Project, with hardware deliveries due from 2027.
No UK-built system appeared on that AUKUS list, a gap Norway and Italy tried to answer in June with a rival submarine-and-drone bid. For the Iver4 900, the effect is to lock in an early lead: a vehicle already inside a US submarine's torpedo tube now sits inside the alliance's flagship undersea programme before European rivals have fielded a comparable answer.