Level 1 - Absolute Beginner

The Strait of Hormuz is a narrow sea road. Many ships use it every day. They carry oil and gas. Now there is a new danger there.

An Iranian officer says seven big cables lie under the water. These cables carry the internet. He says Iran can hit them. Another official also named data centres.

Iran made a list of 122 ships. Iran says these ships broke its rules. The United Nations says about 6,000 sailors are stuck. They are afraid to sail.

The United States army says the strait is open. It says about 97 of every 100 ships pass safely. Oil costs about 109 dollars a barrel.

strait

A narrow area of sea between two pieces of land.

cable

A long thick wire that carries electricity or data.

ship

A big boat that carries people or goods on the sea.

oil

A thick liquid from under the ground used for fuel.

sailor

A person who works on a ship.

list

Names or things written one under the other.

danger

The chance that something bad will happen.

open

Able to be used or entered.

Level 2 - Elementary

The Strait of Hormuz is one of the busiest shipping routes in the world. A large part of the oil that moves by sea passes through it. Since February, fighting between Iran, Israel and the United States has made the strait dangerous, and this week the threats took a new shape.

On Monday a spokesman for Iran's Revolutionary Guard, Hossein Mohebbi, said that seven major undersea cables pass beneath the strait. A day earlier, the senior security official Mohsen Rezaei had mentioned data centres, cables and artificial intelligence sites. Those cables carry phone calls, bank payments and internet traffic between continents.

Iran's Persian Gulf Strait Authority also added 122 vessels to what it calls a non-conformity list. It said 19 ships were in talks with it, two had agreed to be removed and about 30 more might be added. The head of the United Nations shipping agency, Arsenio Dominguez, said about 6,000 seafarers are still trapped and that around 24 ships were attacked in about two weeks.

The United States military disagrees with the picture of a closed waterway. A CENTCOM spokesman, Tim Hawkins, said about 97 percent of ships asking to transit have passed without being hit, and he called the strait open. Brent crude was trading near 109 dollars a barrel on Tuesday.

shipping route

A path at sea that ships regularly follow.

undersea

Located or happening below the surface of the sea.

spokesman

A person who speaks officially for a group.

vessel

A formal word for a ship or large boat.

authority

An official body with power to make rules.

seafarer

Someone whose job is working on ships at sea.

transit

To pass through a place on the way somewhere else.

crude

Oil in its natural state, before it is refined.

Level 3 - Intermediate

For eight months the war between Iran and the United States and Israel has been fought largely over the Strait of Hormuz, a channel so narrow that a single mine or missile can change the price of fuel on the other side of the planet. This week the quarrel widened in a way that had little to do with tankers. Speaking on Monday, a Revolutionary Guard spokesman named Hossein Mohebbi pointed out that seven major undersea cables run beneath the seabed there, a remark widely read as a threat to the physical plumbing of the global internet.

The warning did not arrive alone. On Sunday the veteran security official Mohsen Rezaei had already listed data centres, cables and artificial intelligence facilities among the things Iran might reach for, and the foreign minister, Abbas Araghchi, wrote on social media that Washington was welcome to try its luck again. Iran's Persian Gulf Strait Authority meanwhile published a non-conformity list of 122 vessels accused of transit violations, said 19 more were negotiating with it, and suggested about 30 additional ships could join them.

The practical cost falls on crews. Arsenio Dominguez, who heads the United Nations shipping agency, said roughly 6,000 seafarers remain trapped and that about 24 ships were attacked in a fortnight, urging owners not to transit until there are guarantees. Britain's maritime monitoring agency, UKMTO, counted ten attacks on commercial vessels in and around the strait in a single week and called October the worst month for shipping attacks there since March.

American commanders describe a different strait. Tim Hawkins, a CENTCOM spokesman, said about 97 percent of ships seeking transit have passed unharmed and insisted the waterway is open. Diplomacy continues in parallel: Russia's foreign minister, Sergey Lavrov, visited Tehran on Sunday for the first time since the war began in February, saying Moscow wants to prevent the return of large-scale war, while Pakistan's army chief, General Asim Munir, was due in Tehran on Tuesday as a mediator. Brent crude traded near 109 dollars a barrel as the week opened.

channel

A narrow stretch of water joining two larger areas of sea.

seabed

The floor of the sea.

plumbing

The system of pipes or links that makes something work, used here as a comparison.

violation

An act that breaks a rule or law.

fortnight

A period of two weeks.

guarantee

A firm promise that something will happen.

mediator

Someone who tries to help two sides reach agreement.

unharmed

Not hurt or damaged.

Level 4 - Advanced

Wars fought over chokepoints tend to migrate toward whatever is most fragile, and the Strait of Hormuz has now produced its own version of that logic. On Monday a Revolutionary Guard spokesman, Hossein Mohebbi, observed that seven major undersea cables pass beneath the strait, a sentence delivered less as geography than as inventory. Taken together with Mohsen Rezaei's weekend reference to data centres, cables and artificial intelligence facilities, it signalled a willingness to treat the sinews of global communication as legitimate pressure points, a category of target that is difficult to defend, trivially cheap to damage and almost impossible to attribute with speed.

The maritime front has meanwhile acquired a bureaucratic register. The Persian Gulf Strait Authority's non-conformity list, which grew to 122 vessels this week with 19 said to be negotiating and perhaps 30 more under consideration, converts coercion into paperwork: a shipowner is not told that passage is forbidden, only that its name sits on a register with consequences left unspecified. The effect is a form of insurance-grade deterrence that works whether or not another missile is ever fired, and it sits uneasily beside Abbas Araghchi's insistence that the strait could reopen on the sixth day if Washington complies with Iranian conditions, with talks on the seventh.

Numbers from the two sides describe the same water in incompatible terms. Arsenio Dominguez of the United Nations shipping agency counts roughly 6,000 seafarers trapped and around 24 vessels attacked within a fortnight, and advises against transit absent guarantees; UKMTO logged ten attacks in a week and rated October the worst month since March. CENTCOM's Tim Hawkins answers with a single statistic, that about 97 percent of ships seeking passage have transited unharmed, and the adjective that follows it, open. Both claims can be true at once, which is precisely the problem for anyone pricing risk: the residual three percent is where the war lives.

Diplomacy, as so often, trails the threats it is meant to forestall. Sergey Lavrov's visit to Tehran on Sunday, his first since the February outbreak, framed Moscow's role as the prevention of a wider war, even as Tehran advertises the closeness of the relationship and Washington disputes its substance. General Asim Munir's arrival from Islamabad on Tuesday as an intermediary, Pete Hegseth's unannounced stop in Israel and the American president's public endorsement of Benjamin Netanyahu a week before the Knesset vote all point the same direction: everyone is preparing for a decision that nobody has yet announced. Brent crude near 109 dollars a barrel is the market's provisional estimate of how that resolves.

chokepoint

A narrow passage whose closure would block traffic or supply.

inventory

A detailed list of available items, used here to suggest a list of targets.

sinews

The parts that give something its strength and hold it together.