Saudi tankers reroute at Bab el-Mandeb as Houthis claim control of strait

At the end of July a tanker called the Rodos loaded roughly 700,000 barrels of Saudi crude at Yanbu, pointed it toward India, and then turned around in the Red Sea to take the long way through Suez rather than sail south past Bab el-Mandeb, Reuters reported via India Today on July 22.

The cargo was Saudi; the gate was not safe for Saudi ships. This week the route gave way before the rhetoric did.

The Houthis say they struck eight Saudi oil tankers and turned back 48 more between July 20 and August 19, according to their military claim reported August 20. Yet Yanbu keeps loading. Riyadh is exporting through a strait its adversary claims to control, one turn at a time, and each actor is doing exactly what its incentives dictate.

The Houthis want pressure on Riyadh, and the strait is the cheapest weapon they own; a few missiles raise the cost of every barrel without touching a Saudi field.

Saudi Arabia wants its crude to reach Asian buyers without paying a war toll, so its fleet sails dark or turns north. London's marine insurers, led by the Joint War Committee framework, want to survive the policy year, so they reprice first and explain later. And the shipowners in between hold the least power of anyone: they carry the cargo, absorb the premium, and make the turn-or-push-on decision at sea with incomplete information.

The trigger looks like July 20 onward, when the Houthis declared their blockade and hit tankers including the Encelia, as the Maritime Executive reported in late July. But the pressure underneath is older and slower. Bab el-Mandeb traffic had already fallen by more than half versus the 2023-2025 attack wave before this blockade even started, averaging about 32 ships a day against roughly 50 beforehand, according to Kpler data cited by Reuters in the DeepDraft SITREP of August 12.

Mainstream tanker transits dropped 42 percent in the week after the blockade was announced, down to 53 calls, Lloyds List Intelligence reported on August 6. Every tanker crew that sailed dark since then was a rehearsal for this week's reversals.

War-risk premiums for southern Red Sea voyages jumped to between one and two percent of a vessel's hull value, from around 0.3 percent before the blockade announcement, Insurance Journal reported on July 30. For a large crude carrier that is millions of dollars per voyage, charged before the ship leaves port.

Two insurers went further and withdrew Red Sea war-risk cover entirely, with Gard expanding its exclusion zone effective August 16, the Royal Gazette reported on August 13. When cover disappears, the captain does not need a threat assessment. The u-turns are arithmetic.

The Tanker War model

The Tanker War of 1984 to 1988 in the Persian Gulf offers one bounded comparison: Iran and Iraq attacked hundreds of merchant vessels and traffic kept flowing anyway, because Lloyd's priced every transit and neutral flags absorbed the risk. That analogue says shipping adapts and the strait stays open.

The counter-case argues the other way: this time the attacks target one nation's fleet specifically, and the victim owns the cargo as well as the flag. In 1987 the reflagged Kuwaiti tankers needed an American escort to pass. If Saudi Arabia concludes its own navy cannot provide that escort through Bab el-Mandeb, the model breaks, and rerouting becomes permanent rather than episodic.

Who pays, who profits

Saudi crude bound for Asia takes the long way or waits, burning extra days and extra tonnage. The global tanker fleet effectively shrinks, because the same voyage now consumes more ship-days, which lifts rates for owners everywhere including those who never go near Yemen.

Egypt loses twice. Fewer ships pay Suez tolls precisely when Cairo needs the dollars, while the Cape of Good Hope collects traffic it cannot bill for. The winners are VLCC owners with modern, insurable tonnage and no Red Sea exposure. The losers are Egyptian treasury officials, Asian refiners paying freight premiums, and the Saudi budget, which funds both the exports and the war.

The kingdom with the largest spare production capacity on earth cannot reliably move oil out of its own Red Sea ports. Recent cargoes loaded at Yanbu have sailed with tracking signals off, invisible by choice, Reuters reported in mid-August. Dark sailing defeats the missile threat but also defeats the market, because buyers cannot verify cargoes they are asked to pay war premiums for. Transparency and safety have come apart, and when those separate, discounts follow. Saudi Arabia is discovering that its credibility as a swing supplier depends on ships it does not fully control passing through water it does not govern.

If the Joint War Committee's next listed-areas update keeps the expanded southern Red Sea zone and quoted premiums hold above one percent of hull value, the rerouting hardens into routine. It breaks if a negotiated de-escalation between Riyadh and the Houthis is followed by premiums collapsing back toward pre-July levels within two weeks, with daily transits recovering toward fifty. Freight markets price fear faster than governments resolve it, so the spread between those two timelines is where the money sits.

The seafarers manning those tankers, many from India and the Philippines, absorb the actual risk while the premium is settled in London boardrooms. The fishing communities along the Yemeni and Eritrean coasts watch a strait that carries a tenth of seaborne trade empty by degrees.

Bab el-Mandeb means gate of tears in Arabic, and the name has never needed updating. Whoever prices risk, rather than fires the weapons, decides whether a chokepoint lives or dies.