Limpet Mines Strike Tanker With 27 Indian Sailors in Strait of Hormuz, Crew Safe After Engine Room Fire

The limpet mine attack Strait of Hormuz shipping operators had feared for months has finally happened. On Friday, a Panama-flagged crude oil tanker with 27 Indian crew members aboard was struck by explosives attached directly to its hull, triggering a fire below deck and briefly leaving the vessel dead in the water. All sailors escaped without injury, but the incident confirms that a cheap and highly effective form of sabotage has now entered the conflict in one of the world’s most critical waterways.

What Happened to MT Louise 1

According to Reuters, the tanker MT Louise 1 was approached by a small boat whose occupants fixed two limpet mines to the ship’s hull. When the devices detonated, they ignited a blaze in the engine room and knocked out the vessel’s ability to move.

The crew responded quickly. They brought the fire under control, no oil or fuel leaked into the sea, and the tanker was eventually able to resume its journey under its own power.

The United Kingdom Maritime Trade Operations, the British navy agency that tracks threats to commercial shipping, placed the incident roughly 46 kilometres northeast of Khasab, a port on Oman’s Musandam Peninsula that sits at the narrowest stretch of the strait.

A First Since the War Began

Hostilities between the United States and Iran erupted in February, and merchant vessels passing through the Strait of Hormuz have faced repeated harassment and attacks ever since. Until Friday, however, no limpet mine had been successfully used against a ship in the strait during this conflict.

That distinction matters. Limpet mines are not new to the region. Reuters notes they first appeared in the area in 2017 and were used against tankers in the strait in the years that followed. Their reappearance signals a shift in tactics from the projectiles and warnings seen in recent months toward something more covert and harder to defend against.

Why Limpet Mines Are So Dangerous

The Greece-based maritime risk consultancy Marisks summed up the problem in stark terms. These devices are inexpensive and easy to obtain, and the method of using a small craft to attach them to a passing ship is low-tech yet remarkably effective.

Several features make limpet mines a nightmare for shipping companies:

They are attached below the waterline, where damage can flood compartments or disable propulsion.

Small boats can approach and retreat quickly, often before a crew realises what is happening.

The mines require no missiles, aircraft, or sophisticated targeting systems.

Attribution is difficult, since the attackers leave little evidence behind.

For a tanker the size of MT Louise 1, two mines were enough to start a serious fire and halt the ship. A worse placement, or a slower crew response, could have produced a far more dangerous outcome.

Second Attack in Two Days

The Louise 1 incident was not isolated. A day earlier, MT Arzanah, a Liberia-flagged very large crude carrier, came under fire from projectiles while transiting the strait. Two Indian nationals were among its crew.

Taken together, the two attacks show that vessels in the waterway now face threats from multiple directions: stand-off weapons launched from a distance, and close-quarters sabotage carried out by hand.

Iran’s Pressure Campaign on Shipping

The wider context is a deliberate effort by Iran to assert authority over the Strait of Hormuz. Tehran has targeted ships it claims have breached its transit rules, using those incidents to demonstrate control over the passage and to raise the cost of the conflict for Washington.

Roughly a fifth of the world’s seaborne oil moves through the strait, which means every attack reverberates through energy markets, insurance premiums, and the calculations of shipping firms deciding whether to send vessels through at all.

India’s Response

Because Indian seafarers make up a large share of crews on tankers worldwide, incidents in the Gulf are closely watched in New Delhi. Sarbananda Sonowal, the Union Minister for Ports, Shipping and Waterways, moved quickly to reassure the public.

In a post on X, he confirmed that the sailors aboard the affected vessel are safe and unharmed. He added that the government is keeping constant watch on the situation and working with the ship management companies involved to protect the security and welfare of Indian crews.

The statement reflects a growing concern for the Indian government: with tens of thousands of its citizens employed at sea, any escalation in the Gulf puts large numbers of Indian workers directly in harm’s way.

What Shipping Companies Must Now Consider

The successful use of limpet mines forces operators to rethink their security posture in the strait. Measures that may now become standard include:

Enhanced lookouts and radar watches for small craft during transit.

Faster transit speeds through the narrowest sections to reduce exposure.

Reinforced damage-control drills focused on engine room fires and flooding.

Closer coordination with naval escorts and maritime advisory agencies.

Each of these adds cost and complexity, and none offers a complete guarantee against a determined attacker in a small boat.

The Outlook

Friday’s attack ended without casualties and without an environmental disaster, thanks largely to a well-trained crew. But the event has broken a threshold that had held since February. If limpet mines become a regular feature of the conflict, the Strait of Hormuz will grow more dangerous for every vessel that passes through, and for the Indian sailors who so often crew them.

For now, the 27 men and women aboard MT Louise 1 are safe and their ship is moving again. The next crew may not be as fortunate.