a foreign container ship ran aground in the strait of hormuz after transiting on a route iran had not approved, and tehran framed the grounding as enforcement of its own routing discipline in the world's most important oil chokepoint. tracking data the same day showed traffic splitting across iranian, omani, imo-designated, and dark unidentified routes. a single state unilaterally imposing corridor discipline on an international strait, with vessels visibly complying or hiding, is a structural change in how the chokepoint operates.