Strait of Hormuz Closure

The Strait of Hormuz closure refers to Iran's effective shutdown of this vital 21-mile-wide waterway between Iran and Oman starting early March 2026 amid U.S.-Israeli airstrikes on Iran, disrupting ~20% of global oil/LNG flows and spiking energy prices worldwide. It matters as a test of geopolitical escalation, international law on transit straits, and global energy resilience.

Competing Hypotheses

IRGC Ran Selective Toll Booth [alternative] (score: 40.6) — IRGC established a permissioned toll system via VHF vetting for U.S./Israel links, $2-4M yuan/USDT payments through intermediaries, and clearances for territorial channels north of Larak Island, allowing allied oil flows (China/India/Pakistan) while blocking others to fund operations and test de-dollarization.
Insurance Halted All Traffic [alternative] (score: 17.8) — Seven London insurers synchronized war-risk exclusions post-strikes, spiking premiums to 5% vessel value and incorporating IRGC clearance as a risk factor, creating a commercial blockade where owners rationally avoided transits regardless of Iranian capacity.
US Strikes Created Pretext Trap [alternative] (score: 22.9) — U.S. timed Operation Epic Fury strikes despite low Gulf reserves and Iranian historical bluffs, deliberately provoking a self-harming blockade to boost U.S./Russia market share, justify escorts, and reassert chokepoint control per 2025 NSS.
Iran Closed Strait with Attacks [official] (score: 2.3) — Iran deliberately blockaded the Strait starting February 28, 2026, using IRGC VHF warnings, public closure declarations, and 20+ coordinated attacks with drones, missiles, sea drones, and mines on merchant vessels to deny innocent passage in retaliation for U.S.-Israeli airstrikes.
Iran Defended with Vetting Only [alternative] (score: 44.3) — Iran implemented legitimate self-defense via GPS jamming, warnings, and selective targeting of enemy-linked ships, permitting neutrals/allies after ownership vetting while disruptions stemmed from owner hesitation and insurers.
US Staged Attacks for War [alternative] (score: 1.3) — U.S./Israel staged or exaggerated vessel attacks and minelaying claims using covert assets to fabricate a blockade pretext for escalated military intervention, energy dominance, and regime change.
Chaos from Tit-for-Tat Strikes [alternative] (score: 37.3) — No centralized blockade; de facto closure emerged from mutual attacks (Iranian drones/mines vs. U.S. responses), insurance panic, GPS jamming, and owner inertia, with persistent allied transits showing lack of enforcement intent.
Selective Permissions for Geopolitical Allies [alternative] (score: 40.9) — IRGC prioritized clearances for China/India/Pakistan-owned vessels post-US frigate strike, using ownership/crew vetting via networks to favor oil revenue/de-dollarization partners over neutral fertilizer carriers.
Gulf States' Mutual Deterrence Pact [alternative] (score: 15.0) — Saudi/UAE/Kuwait muted responses despite 60-70% export losses stem from implicit Iranian threats and shared incentives for restraint, fearing reprisals given low reserves (Saudi 65 days, UAE 16-19) and asymmetric Iranian endurance.
Pentagon Overconfidence Trap [alternative] (score: 22.2) — US intelligence/doctrinal models dismissed Iranian Hormuz commitment based on historical bluffs, prompting premature strikes that triggered resolve-testing blockade amid underreported minelaying capacity.
Mundane Wartime Chaos [null] (score: 2.3) — De facto closure from coincidence of tit-for-tat strikes, insurance reactions, jamming, and owner caution without centralized Iranian blockade policy or hidden motives; routine wartime incompetence.

Evidence Indicators (14)

20+ attacks on vessels reported
Traffic dropped 81% post-Feb 28
Iranian FM denied full closure
Selective Chinese/Pakistani transits March 5-16
War-risk premiums spiked 4-6x
No formal blockade declaration made
16 Iranian minelayers destroyed
Gulf states issued no joint pressure
US admin admitted underestimation
Pre-strike outgoing traffic heavy Feb 28
No mass sinkings despite low transits
Oil prioritized over fertilizer transits
Insurers pulled P&I for 200+ vessels
AIS gaps in some attack reports

Behavioral Indicators (6)

Gulf states muted on closure despite losses
Selective oil transits over fertilizer
Insurers synchronized war-risk exclusions
US admin admitted underestimating resolve
Heavy outgoing traffic pre-US strikes
Persistent allied transits amid 81% drop

Intelligence Report

Executive Summary In late February 2026, the Strait of Hormuz—a narrow chokepoint carrying about 20% of the world's oil—saw shipping traffic plummet amid escalating conflict between Iran and a U.S.-Israeli coalition. The trigger: U.S.-Israeli airstrikes on February 28 under Operation Epic Fury, killing Iran's Supreme Leader Ali Khamenei and hitting military and nuclear sites. Iran responded with IRGC radio warnings, public statements claiming "complete control," and reports of 20+ attacks on merchant vessels using drones, missiles, sea drones, and mines, sinking one tug and killing at least nine crew members. Traffic dropped 81% by early March, oil prices spiked (Brent to $126/barrel, Dubai to $166), and Gulf exports halved, stranding over 200 vessels. Explanations range from the official narrative—Iran deliberately blockaded the strait in retaliation—to alternatives like selective IRGC permissions for allies, insurance-driven paralysis, U.S. provocation traps, or wartime chaos. After rigorous adversarial review challenging biases, source reliability, and overlooked counter-evidence, the evidence best supports "Iran Defended with Vetting Only" as Very Strong, closely followed by "Selective Permissions for Geopolitical Allies" and "IRGC Ran Selective Toll Booth" (both Very Strong). These portray Iran as imposing coercive vetting or tolls on select ships rather than a blanket closure. The official story ("Iran Closed Strait with Attacks") rates Poor, undermined by persistent allied transits and institutional echo chambers. The conclusion is moderately solid: strong patterns in shipping data and Iranian statements align with selective controls, but gaps in VHF logs and payment traces leave room for insurance or chaos explanations. Hypotheses Examined IRGC Ran Selective Toll Booth (Very Strong) This theory claims the IRGC set up a VHF radio vetting system checking for U.S./Israeli links, demanding $2-4 million tolls in yuan or USDT via intermediaries, and issuing...