Belgium Deploys Primula Minehunter Near Hormuz as US-Iran Crisis Threatens Shipping.

Belgium is moving a mine warfare vessel closer to the Mediterranean as tensions around the Strait of Hormuz raise the risk of naval disruption. The repositioning strengthens readiness to secure critical sea lanes where mining threats could quickly impact global energy flows and military mobility.

BNS Primula will operate in a forward standby role, allowing rapid deployment to detect and neutralize naval mines if the crisis escalates. This posture reflects a broader emphasis on protecting maritime chokepoints, where mine countermeasure forces play a key role in ensuring freedom of navigation and sustaining allied operations.

Related Topic: Belgium donates last four Tripartite-class minehunters to Bulgaria to secure Black Sea naval routes

BNS Primula, a Belgian Tripartite-class minehunter, prepares for potential redeployment toward the Strait of Hormuz amid renewed mine warfare concerns and escalating US-Iran maritime tensions. (Picture source: Belgian Navy)

The operational context further deteriorates on Saturday, April 18. After announcing the reopening of the strait to commercial shipping the previous day, Iran reinstated restrictions in the morning under direct military control and indicated that this posture will remain in place as long as the U.S. blockade of Iranian ports continues. In parallel, U.S. Central Command (CENTCOM) confirms that the blockade targets vessels entering or leaving Iranian ports, while stating that navigation toward non-Iranian destinations through Hormuz remains unaffected. In practice, this creates a grey zone in which transit is neither fully blocked nor fully secure, generating immediate military and insurance risks for global energy flows.

Within this context, Belgian media reported on April 17, 2026, that the core ministerial cabinet approved the positioning of Primula toward the Mediterranean in connection with the Hormuz crisis. No detailed public communication from the Belgian Ministry of Defence has clarified the exact timeline, staging area, or rules of engagement. At the same time, CENTCOM announced on April 11 that it had begun “setting the conditions” for a mine-clearing operation in the strait, involving two destroyers and the planned deployment of underwater drones. This indicates that Washington has already initiated its own military response, while the Belgian move reflects a reserve posture rather than immediate frontline engagement.

The deployment also occurs against the backdrop of Belgium’s planned divestment of its Tripartite-class minehunters, approved in September 2025, under which the remaining vessels are to be transferred to Bulgaria. However, these ships remain operational pending their effective handover, allowing units such as Primula to be deployed in response to emerging crises and highlighting a transitional phase between legacy mine countermeasure capabilities and the future RMCM fleet.

Primula nonetheless remains a relevant asset in this environment. The vessel, a Tripartite-class minehunter built at the Mercantile-Belyard shipyard in Rupelmonde and launched in December 1990, displaces approximately 605 tonnes at full load, measures 51.5 meters in length, and reaches a maximum speed of around 15 knots. Its propulsion is based on a Werkspoor RUB 215 V12 diesel engine rated at 1,370 kW, supported by ACEC active rudders and a HOLEC bow thruster. The ship is not designed for speed but for controlled maneuvering at low velocity, precise station-keeping, and reduced acoustic and magnetic signatures during mine-hunting operations. With a range of about 3,000 nautical miles at 12 knots, it can deploy over distance and sustain operations once in theater.

Its sensor-to-effect chain remains consistent with its role despite its age. Primula is equipped with a Thales Underwater Systems TSM 2022 Mk III hull-mounted sonar and a SAAB Bofors Double Eagle Mk III variable-depth sonar, allowing detection and improved classification of seabed and suspended objects depending on environmental conditions. The vessel also carries up to ten Atlas Elektronik Seafox systems, fiber-optically guided remotely operated vehicles used for visual identification and neutralization. Seafox operates as a one-shot system equipped with a camera and an explosive charge, enabling targeted destruction of mines without exposing the host vessel to direct risk. This combination of detection, inspection, and neutralization is particularly suited to narrow waterways where a limited number of mines can disrupt maritime traffic.

A minehunter such as Primula cannot clear a strait in a short timeframe. Operations proceed slowly, sector by sector, prioritizing certainty over speed. This raises the question of force volume. The United States maintains its own mine countermeasure capability in the region. Following the withdrawal of Avenger-class vessels from Bahrain in 2025, the U.S. Navy is progressively replacing them with Littoral Combat Ships equipped with the Mine Countermeasures Mission Package. USS Canberra, already deployed in Bahrain, is described as the first LCS in the region with this combination of unmanned systems and sensors capable of detecting, identifying, and neutralizing mines while increasing stand-off distance from threats. Four LCS are expected to replace the legacy fleet, indicating that the United States retains an autonomous response capacity.

However, the ability to act alone does not necessarily imply that it is optimal to do so. A sustained mine-clearing effort, combined with escort operations, surveillance of approaches, and reassurance of commercial shipping, rapidly consumes resources, particularly if the threat remains ambiguous or deliberately managed through intermittent restrictions and pressure on shipping actors. NATO maintains permanent mine countermeasure groups, Standing NATO Mine Countermeasures Groups 1 and 2, composed of minehunters and minesweepers tasked with detection and neutralization operations. These formations are designed for collective action and sustained presence, rather than replacing a U.S.-led response in an active crisis environment. The value of European or NATO contributions therefore extends beyond hull numbers, including burden-sharing, logistical resilience, and the ability to sustain operations over time.

The repositioning of Primula carries operational meaning beyond symbolic signaling. If restrictions in Hormuz persist beyond April 18 and the U.S.-Iran confrontation continues, the requirement will extend beyond a limited number of mine-clearing units. What becomes necessary is a broader framework capable of demonstrating, over time, that a secure maritime corridor effectively exists. Within that framework, Belgium contributes a specialized capability that remains politically controlled and operationally relevant in a domain where a limited number of well-placed mines can disrupt maritime flows more effectively than more visible forms of force projection.

Written By Erwan Halna du Fretay - Defense Analyst, Army Recognition Group
Erwan Halna du Fretay holds a Master’s degree in International Relations and has experience studying conflicts and global arms transfers. His research interests lie in security and strategic studies, particularly the dynamics of the defense industry, the evolution of military technologies, and the strategic transformation of armed forces.