During a conflict, war risk underwriters differentiate premiums based on a vessel's situation. Ships already trapped in a high-risk zone pay a much lower rate (e.g., 0.5% of hull value) to get out, compared to ships voluntarily entering the zone to trade, which face rates as high as 3-10%.

A little-known feature of marine insurance is that the war risk component can be canceled by insurers with just a few days' notice during a crisis. Shippers are then forced to repurchase coverage at premiums that can be 10 to 30 times higher than the original rate, drastically altering voyage economics.

Dr. Anas Al-Hajji asserts that Iran did not militarily close the Strait of Hormuz. The disruption was caused by European insurance companies canceling policies for tankers under EU solvency rules after an attack near Sri Lanka expanded the perceived risk zone, making transit impossible for uninsured ships.

Following attacks on Amazon's Gulf infrastructure, war risk insurance costs have surged 1900%, with coverage limits plummeting. Since financing for projects like data centers requires insurance, this market freeze acts as a financial choke point, halting new construction in high-risk regions regardless of a company's capital.

Ship owners need separate insurance policies because the market is specialized. Mutual P&I clubs cover unpredictable third-party liabilities (e.g., pollution). Commercial underwriters handle asset-based risks like physical ship damage (hull & machinery) and war, which they can price more conventionally.

The critical choke point of the Strait of Hormuz is closed not by military force, but by economics. Commercial shipping requires insurance, which is now either unavailable or prohibitively expensive for the region. Even with naval escorts, ships will not sail without coverage, making this an insurance-driven crisis.

Iran effectively weaponized the Strait of Hormuz not with mines, but by creating enough uncertainty to make UK-based insurance companies pull out. This demonstrates how financial systems can be leveraged as powerful geopolitical choke points.

P&I insurance premiums are calculated as a rate per ton, but the tonnage itself doesn't signify risk. The "rate" is the variable that reflects the vessel's specific risk profile (e.g., a cruise ship vs. a barge). Tonnage simply scales that risk-based rate to the vessel's size.

When a ship is already in a crisis zone and its insurance is canceled, it has no choice but to renew at exorbitant rates. This triggers an immediate, intense negotiation—a 'slugfest'—between the ship owner and the cargo owner to determine who is contractually obligated to absorb the massive, unforeseen costs.