In the past 24 hours, the situation in the Strait of Hormuz has shifted from fragile tension to open confrontation. Multiple maritime reporting channels, including UK maritime security authorities, & CNN International Editor, Nic Robertson, reporting from Islamabad, confirm that Iranian gunboats engaged at least one commercial tanker transiting north of Oman, with additional vessels struck by gunfire or projectiles as they attempted passage.
Within hours of these incidents, Tehran formally declared the Strait closed once again, framing the move as a response to the ongoing U.S. naval blockade and warning that no safe transit can be guaranteed.
The result is immediate operational ambiguity:
ships are turning back
insurers are recalculating risk
the world’s most critical energy chokepoint is, in practical terms, no longer functioning as a reliable maritime corridor.
The current reporting tracks with a familiar pattern in the Persian Gulf.
When Tehran signals closure of the Strait, what follows is not a conventional naval engagement, but a layered denial campaign built around the Islamic Revolutionary Guard Corps Navy.
I’ve seen these IRGC small boat tactics before, during the Iran-Iraq war, in the late 80’s. Operation EARNEST WILL, and Operation PRIME CHANCE. We engaged the IRGC nightly, with AH-58 attack helicopters, armed with 20mm cannons, and Hellfire missiles, and Navy Seal Small Boat Crews, in combat for over a year, identifying their covert mining in the Persian Gulf, then sending them to the bottom of the gulf.
https://en.wikipedia.org/wiki/Operation_Prime_Chance
This is their operating environment.
The Platforms: Small, Fast, Disposable, Effective
The first visible indicator is increased small-boat activity, rapidly populating the surface picture
Primary types:
Boghammar-type speedboats Commercial Swedish hulls adapted for combat use. Crew: 2-4 Speed: 40-50 knots Armament: 12.7mm DShK heavy machine guns, RPG-7, recoilless rifles Role: harassment, swarm initiation, close-in attack
Peykaap / Peykaap II fast attack craft Indigenous missile-capable platforms. Crew: 2-3 Speed: 50+ knots Armament: short-range anti-ship missiles (C-701 / Nasr class), machine guns Role: standoff strike within cluttered maritime environments
Zolfaghar and Seraj-class boats Higher-speed, maneuver-focused variants. Crew: 3-6 Speed: up to 60 knots Armament: heavy machine guns, rockets, possible missile integration Role: maneuver elements within swarm formations
Ashura-class patrol boats Slightly larger, used for coordination and localized control
These are not capital assets. They are low-cost, high-volume attack nodes designed for redundancy and attrition.
The Mine Warfare Component: The Actual Strait Denial Mechanism
If the Strait becomes effectively closed, mines will be the primary mechanism.
Iran fields a mixed inventory:
Moored contact mines (legacy Soviet-derived systems)
Bottom influence mines (magnetic, acoustic, pressure-activated)
Limpet mines (manually emplaced on hulls)
Delivery methods:
Small fast boats operating at night
Modified commercial vessels
Limited subsurface delivery platforms
Operational crews are minimal, typically 2-3 personnel. Deployment is rapid and designed for ambiguity.
Full coverage is not required. Limited, well-placed mining creates uncertainty. Insurance markets and commercial operators react immediately, amplifying the effect.
Command and Control: Distributed and Intent-Driven
The Islamic Revolutionary Guard Corps employs a command model that differs significantly from Western naval doctrine:
Decentralized execution with local commander authority
Pre-briefed mission intent, not continuous oversight
Redundant communications using VHF, handheld encrypted systems, and visual signaling
Shore-integrated ISR, linking coastal radar, surveillance, and missile batteries
Precision coordination is not required. The objective is synchronized pressure across multiple domains.
Tactics, Techniques, and Procedures: Swarm, Saturate, Destabilize
Observed and historically consistent TTPs include:
1. Swarm Operations Multiple small craft converge from dispersed vectors, compressing reaction time and sensor clarity.
2. Close-Range Harassment High-speed passes at minimal distance with visible armament, forcing rapid escalation decisions.
3. Layered Threat Environment Simultaneous pressures:
Mine deployment
Coastal anti-ship missile readiness
UAV and ISR coverage
4. Environmental Exploitation Operations optimized for:
Night conditions
Dense commercial traffic
Narrow maritime chokepoints
5. Psychological and Economic Leverage The objective is not immediate destruction, but disruption of confidence. Once shipping risk is perceived as unacceptable, transit halts.
Operational Context
During Operation Earnest Will and Operation Prime Chance, these same core methods were encountered repeatedly.
This form of conflict is characterized by:
Close-range, high-speed engagements
Ambiguous attribution environments
Adversaries operating within familiar terrain
Acceptance of losses in exchange for cumulative effect
The objective is not tactical victory in isolation. It is the degradation of the operating environment.
Bottom Line
What comes next is unlikely to be rhetorical. Once the Strait is perceived as unsafe, the burden shifts to the United States to restore freedom of navigation or concede strategic initiative.
Historically, that has triggered a rapid transition from observation to action:
persistent ISR
maritime exclusion enforcement
systematic neutralization of mine-laying platforms and swarm assets before they can regenerate.
The U.S. Navy does not need to sink a fleet to reopen the Strait - it needs to reestablish credibility, visibly and decisively, in the face of layered denial.
That means helicopters over the water at night, surface combatants pushing forward into contested lanes, and precision strikes against any platform that demonstrates hostile intent. The risk is not miscalculation - it is inevitability.
Once commercial shipping halts and energy markets react, time compresses. The next phase will not be ambiguous. It will be a measured but unmistakable assertion that the Strait remains open by force, and that any actor attempting to close it will pay a price they cannot absorb.
If current indicators point toward escalation, the mechanism follows a predictable sequence:
Increased swarm activity to signal intent
Mine threat introduction to trigger commercial withdrawal
Missile and ISR overwatch to deter intervention
The Strait does not need to be physically blocked to be closed.
It only needs to be perceived as unsafe.