Oil tankers moving through the Strait of Hormuz do not operate in a vacuum. Every voyage is backed by layers of maritime insurance that quietly absorb the financial risks of shipping millions of barrels of crude through narrow waterways and politically volatile regions. Most of the time those costs remain relatively stable, just another operational line item for shipowners and energy traders. But when tensions rise in the Strait of Hormuz, the insurance system reacts almost instantly, and the price of moving oil through the corridor can jump dramatically.