It Loaded Oil in Saudi Arabia, Vanished off Every Tracking Screen, and Docked in Mumbai. Here Is the Full Story.
On the morning of March 12, 2026, a Liberia-flagged oil tanker named Shenlong quietly berthed at Jawahar Dweep, Mumbai's dedicated crude oil terminal, and began discharging its cargo — 1,35,335 metric tonnes of Saudi Arabian crude oil destined for refineries in Mahul, eastern Mumbai.
It was the first tanker headed to India to successfully navigate the Strait of Hormuz since the United States and Israel launched Operation Epic Fury against Iran on February 28. But the Shenlong's voyage was not a routine delivery. It was a calculated gamble through the most dangerous stretch of water on earth — and for a critical portion of that journey, the ship simply disappeared.
How the Voyage Unfolded: From Ras Tanura to Mumbai
The tanker loaded crude oil from Ras Tanura Port in Saudi Arabia on March 1 and departed two days later. Maritime tracking data from Lloyd's List Intelligence and TankerTrackers indicated that the vessel was last recorded inside the Strait of Hormuz on March 8. Windward
Then it vanished.
As the vessel approached the most sensitive section of the strait, its tracking signals disappeared temporarily. Experts believe the tanker switched off its AIS — Automatic Identification System — transponders to avoid detection while crossing the dangerous stretch. Shipping companies sometimes use this tactic during conflicts to reduce the risk of being targeted or tracked by hostile forces. After successfully passing through the high-risk area, the vessel reappeared on maritime tracking systems on March 9 as it continued its journey toward India. Wionews
The tanker later reached Mumbai at around 1 PM on March 12 and was berthed at Jawahar Dweep at approximately 6:06 PM. Deputy Conservator Praveen Singh confirmed that the vessel is carrying 1,35,335 metric tonnes of crude oil, which is currently being discharged and will be transported to refineries in Mahul in eastern Mumbai. Windward
What "Going Dark" Actually Means — and Why Ships Do It
To understand the significance of this voyage, you need to understand what AIS is, why it exists, and why switching it off is both technically simple and legally complicated.
The International Convention for the Safety of Life at Sea — signed by 167 countries — requires almost every commercial vessel to carry a radio transponder that broadcasts the ship's identity, position, speed and heading to port authorities, coast guards and commercial tracking networks. That international agreement requires ships to leave the transponders on and active. But there is no physical mechanism preventing a crew from switching it off or broadcasting a false position. When a vessel turns off its transponder and goes dark, it doesn't trigger an alarm at some global maritime headquarters. There is no such headquarters. The ship simply disappears from the map. Every map. The Washington Post
In peacetime, going dark is a red flag associated with sanctions evasion, smuggling, and illegal cargo. In a war zone, it is a survival strategy — if a hostile navy or drone operator cannot see you on a tracking screen, your chances of being targeted fall dramatically.
Evidence suggests the vessel loaded approximately one million barrels of crude oil at Saudi Arabia's Juaymah Terminal before switching off its AIS signal around March 4 and remaining dark for approximately five days before reappearing around 07:00 UTC on March 9. The manoeuvre suggests that a small number of operators are attempting to exploit extremely high freight premiums by conducting dark passages through the Strait, minimising visibility during the highest-risk segment of the voyage. Bloomberg
What Was Happening in the Strait While the Shenlong Was in It
The Hormuz that the Shenlong navigated between March 4 and March 8 was not a normal waterway. It was, in effect, an active combat zone.
Just after midnight on March 2, no tankers in the strait broadcast AIS signals at all, indicating near-zero traffic. Protection and indemnity insurance was removed for March 5, making the economic risk too high for most ship owners to use the strait. By March 4, the IRGC claimed complete control of the strait, and at least eight vessels had been damaged by that point. Military.com
On March 4 alone, only five vessel crossings were recorded across the entire strait. GPS jamming affected more than 1,650 ships in the Middle East Gulf on March 7 — a 55% increase from the previous week — erroneously placing vessels across land and sea in Kuwait, Iran, Saudi Arabia, Oman and the UAE. Wikipedia
Iran's Foreign Ministry spokesman Esmail Baghaei warned publicly that all tankers and maritime navigation must be "very careful" as long as the situation remains insecure. Al Jazeera The US Energy Secretary briefly and incorrectly claimed the US Navy had escorted a tanker through — a claim that was rapidly corrected, underlining the fog of war surrounding every transit.
The Dark Fleet: A Global System That Predates This Crisis
The Shenlong's dark transit did not invent a new tactic. It used one that is now a well-established feature of global energy trade — the so-called "shadow" or "dark fleet."
According to maritime intelligence firm Windward, approximately 1,100 dark fleet vessels have been identified globally, representing roughly 17% to 18% of all tankers carrying liquid cargo. The dark fleet did not emerge because the maritime system is broken — it emerged because the system is built on voluntary participation. The Washington Post
Iran began using dark fleet tactics in 2018 after sanctions were reimposed. Russia dramatically expanded the system in 2022 after its invasion of Ukraine. Now, with the Strait of Hormuz effectively closed to conventional maritime trade, the only vessels still moving with regularity are the ones operating outside the rules. Zee News
Windward detected a more than 200% increase in dark vessel activity during the first night of the Iran-US escalation alone — the immediate, system-wide response of the global shipping industry to the new threat environment. NPR
India's Larger Shipping Crisis: 28 Ships Still Stranded
The Shenlong's successful arrival is a relief — but it should not obscure the scale of what India still faces.
Several Indian vessels remain near the Strait of Hormuz. According to the Directorate General of Shipping, 28 Indian-flagged ships were operating in or near the region when the conflict began. At least seven vessels — including Desh Mahima, Desh Abhiman, Swarna Kamal, Vishva Prerna, Jag Viraat, Jag Lokesh, and LNGC Aseem — have since moved to safer waters in the Arabian Sea. Another ship, Jag Lakshya, has reportedly headed toward Angola. Windward
Shipping authorities say there are currently no formal restrictions preventing Indian ships from transiting the Strait of Hormuz, but vessel operators are advised to carefully assess security risks and maintain situational awareness. Windward That careful language masks a brutal reality: in a strait where naval mines are now reportedly being planted and IRGC drones are active, "carefully assess" means "decide if your crew's lives and your cargo are worth the freight premium."
The Rerouting Problem: Why Cape of Good Hope Is Not a Simple Fix
With Hormuz effectively closed to most traffic, the global shipping industry is rerouting — but the alternatives are expensive, slow, and increasingly under strain.
Regional shipping activity is redistributing across alternative routes, with Cape of Good Hope transits surging sharply, reflecting a growing shift toward long-haul rerouting around the Middle East and Red Sea risk environment. Bloomberg
Oman's deep-water ports of Duqm, Salalah and Sohar in the Arabian Sea, which could allow tankers to bypass the strait, are no longer fully safe either — in March 2026 several drones struck Duqm and Salalah, with at least one fuel storage tank in Duqm damaged. The Joint War Committee of the London insurance market subsequently included waters around Oman in its list of high-risk maritime areas. Military.com
The Cape of Good Hope route adds approximately 6,000 nautical miles — and 10 to 15 extra days of sailing — to a typical Gulf-to-India oil shipment. In volume terms, it works. In cost terms, it is devastating: freight rates have already surged, war-risk insurance premiums have multiplied, and every extra day at sea is fuel, crew wages, and depreciation.
The Bottom Line
The Shenlong's voyage tells you everything you need to know about India's energy situation right now. A ship loaded Saudi oil, switched off every tracking system it carried, sailed blind through a war zone for five days, emerged safely, and docked in Mumbai. The crew took that risk — presumably for significantly elevated freight premium — so that India's refineries could keep running.
Roughly 30% of the world's seaborne crude oil transits the Strait of Hormuz. In addition, nearly 20% of global jet fuel and about 16% of gasoline and naphtha flows also pass through the strait. NBC News India, which imports more than half its crude through this corridor, cannot simply reroute its energy supply overnight.
The Shenlong made it. The next tanker's crew will have to make the same calculation. And the one after that. Until the war ends, or until India builds the strategic reserves and alternative supply chains that this crisis has made urgently, undeniably necessary — going dark in the Strait of Hormuz may be the best option India's oil supply chain has.
That is not a comfortable conclusion. It is the honest one.
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