[VIDEO] US Submarine Sinks Iranian Frigate IRIS Dana Off Sri Lanka With Mk-48 Torpedo — 180 Feared Dead in First Submarine Warship Kill Since World War II

(DEFENCE SECURITY ASIA) — The torpedoing of the Iranian Navy frigate IRIS Dana by a United States Navy submarine off Sri Lanka has triggered one of the most consequential naval escalations in the Indian Ocean in decades, with Sri Lanka’s deputy foreign minister confirming to international media that at least 180 Iranian personnel are feared dead.

The strike, executed under the broader American military campaign known as Operation Epic Fury aimed at dismantling Iran’s maritime combat capabilities, represents the first confirmed instance since World War II in which a U.S. submarine has destroyed an enemy warship using a heavyweight torpedo.

Sri Lankan authorities confirmed the incident occurred in international waters near the southern port city of Galle, where the nation’s Foreign Ministry verified the sinking while the deputy foreign minister described the casualties as catastrophic and rescue operations as ongoing amid an unfolding maritime crisis.

The dramatic engagement has stunned global defence analysts because it signals the return of lethal submarine-on-surface combat operations in an era dominated by missile warfare, while simultaneously projecting American undersea dominance deep into the Indian Ocean strategic theatre.

Footage released by the U.S. military reportedly shows the precise moment a heavyweight torpedo struck the 1,500-ton Iranian warship, triggering a catastrophic underwater detonation that broke the vessel’s hull and sent the frigate rapidly to the seabed.

Sri Lankan naval authorities confirmed that approximately 180 Iranian sailors were believed to have been aboard the IRIS Dana when the torpedo struck, though early casualty reports vary as rescue operations and manifest verification continue.

Initial rescue operations conducted by Sri Lankan vessels reportedly recovered 32 surviving Iranian sailors who were transported to hospitals in Galle, while more than one hundred personnel remain missing amid ongoing search operations.

The naval engagement occurred concurrently with another strike that reportedly left the Iranian IRGC Navy corvette IRIS Shahid Sayyad Shirazi engulfed in flames, indicating a coordinated campaign targeting Iranian naval assets.

These events collectively mark a decisive maritime phase in Operation Epic Fury, which U.S. military planners describe as a comprehensive effort to dismantle Iranian naval capabilities and secure critical global sea lanes.

For Asia’s maritime economies, the confrontation unfolding off Sri Lanka carries profound implications because the Indian Ocean forms the strategic artery connecting Middle Eastern energy supplies with Asian manufacturing economies through the Malacca Strait.

The Torpedo Strike That Rewrote Modern Naval Warfare

The destruction of the IRIS Dana represents the first confirmed torpedo sinking of an enemy warship by a United States submarine since the conclusion of World War II, marking a historic revival of undersea combat doctrine in modern naval warfare.

The engagement demonstrates how stealth-driven undersea warfare continues to dominate maritime conflict dynamics, because nuclear-powered attack submarines can detect, track, and destroy surface combatants without exposing themselves to counter-attack.

The torpedo reportedly used in the engagement is the Mk-48 heavyweight torpedo, a wire-guided acoustic homing weapon specifically engineered to defeat heavily armed surface combatants through devastating underwater detonations.

Unlike missile strikes that rely on direct impact, the Mk-48 exploits the “under-the-keel” effect in which an underwater detonation breaks a vessel’s structural integrity by generating a gas bubble that collapses beneath the ship.

This phenomenon effectively lifts the vessel before violently snapping the hull, often causing catastrophic structural failure that results in rapid sinking with minimal opportunity for crew evacuation.

The reported footage released by the United States military appears to illustrate precisely such an under-keel detonation, showing a massive underwater explosion that fractured the IRIS Dana’s hull before the warship disappeared beneath the surface.

For naval strategists, the footage provides rare visual confirmation of the lethal mechanics of modern torpedo warfare, a capability that has rarely been publicly demonstrated since the mid-twentieth century.

The attack also highlights the strategic advantage of submarine stealth because the targeted vessel reportedly had no opportunity to detect the attacking submarine prior to the torpedo strike.

In operational terms, the incident reinforces a long-standing naval doctrine: that control of the undersea domain remains the decisive factor in high-intensity maritime conflict.

Operation Epic Fury and the Systematic Targeting of Iranian Naval Power

The torpedo strike on the IRIS Dana forms part of Operation Epic Fury, a wider military campaign designed to dismantle Iran’s ability to project maritime power across critical sea lanes linking the Persian Gulf to the wider Indo-Pacific.

According to statements from U.S. officials, the operation involves coordinated strikes against Iranian naval assets, infrastructure, and command networks intended to degrade Tehran’s capacity to threaten global shipping routes.

The destruction of the IRIS Dana demonstrates the campaign’s maritime dimension, signalling that Iranian warships operating beyond home waters may be targeted wherever they are encountered.

Simultaneously, reports that the IRIS Shahid Sayyad Shirazi was left burning after being struck by U.S. forces suggest a coordinated effort to neutralise multiple Iranian naval platforms in a single operational window.

Such coordinated targeting indicates that Operation Epic Fury is structured around rapid, multi-domain strikes designed to overwhelm Iranian command-and-control capabilities before they can respond effectively.

For Washington, the operation carries strategic messaging aimed at both adversaries and allies by demonstrating the United States’ willingness to employ decisive force to secure maritime trade routes.

For Tehran, however, the loss of a modern frigate represents a major operational setback that may constrain the Iranian Navy’s ability to operate far from its home waters.

The destruction of these vessels also signals that Iranian naval deployments into the Indian Ocean may now face persistent surveillance and engagement from advanced U.S. undersea platforms.

This dynamic dramatically alters the risk calculus for Iranian maritime operations beyond the Persian Gulf theatre.

IRIS Dana: Iran’s Indigenous Frigate Meets Undersea Dominance

The IRIS Dana belongs to the Moudge-class of Iranian frigates, an indigenous warship programme developed by Tehran as part of its broader effort to achieve defence self-sufficiency despite decades of international sanctions.

Displacing approximately 1,500 tonnes and measuring roughly 95 metres in length, the frigate represents one of the more capable surface combatants in the Iranian Navy’s inventory.

The warship is equipped with a Fajr-27 76mm naval gun, Noor or Qader anti-ship cruise missiles, Mehrab or Sayyad surface-to-air missiles, and torpedo tubes intended for anti-submarine warfare operations.

The vessel also possesses the capability to operate a helicopter for reconnaissance and anti-submarine missions, enhancing its operational reach beyond line-of-sight maritime surveillance.

In Iranian naval doctrine, Moudge-class frigates serve as multi-role platforms capable of conducting escort missions, maritime patrols, and presence operations across regional waters.

The deployment of the IRIS Dana into the Indian Ocean therefore likely formed part of a broader Iranian strategy to demonstrate maritime reach beyond the Strait of Hormuz.

However, the encounter with a modern U.S. nuclear-powered attack submarine exposed the vulnerability of surface combatants operating without robust anti-submarine screening.

The rapid sinking of the frigate underscores the asymmetry between surface fleets and advanced undersea warfare platforms.

For defence planners worldwide, the incident reinforces the enduring vulnerability of surface warships to stealthy submarine attacks.

The Burning of IRIS Shahid Sayyad Shirazi and IRGC Naval Strategy

Simultaneously with the sinking of the IRIS Dana, reports emerged that the IRIS Shahid Sayyad Shirazi — a Soleimani-class corvette operated by the Islamic Revolutionary Guard Corps Navy — was engulfed in flames after being targeted by U.S. forces.

The Soleimani-class platform represents a new generation of Iranian naval vessels designed specifically for asymmetric maritime warfare against technologically superior adversaries.

Displacing approximately 600 tonnes and measuring roughly 65 to 68 metres in length, the corvette features a catamaran hull designed to enhance speed and stability in high-tempo operations.

Iranian sources claim the vessel can reach speeds exceeding 30 knots, with some estimates suggesting maximum speeds approaching 45 knots under optimal conditions.

The warship reportedly carries multiple anti-ship cruise missiles alongside vertical launch systems for longer-range strike weapons and surface-to-air missile systems.

These features reflect Iran’s strategy of employing high-speed missile-armed vessels capable of conducting hit-and-run attacks against larger adversary fleets.

The targeting of the Shahid Sayyad Shirazi therefore represents an attempt to neutralise not only traditional Iranian naval assets but also platforms central to Tehran’s asymmetric maritime doctrine.

If confirmed, the damage inflicted on the corvette would further weaken Iran’s ability to project naval power beyond its immediate coastal waters.

Indian Ocean Shockwaves: Strategic Implications for Asia

The naval engagement off Sri Lanka carries profound strategic implications for Asian maritime security because the Indian Ocean forms the primary energy supply corridor connecting the Middle East with East Asia.

Any sustained naval confrontation in these waters risks disrupting shipping routes that transport oil and liquefied natural gas to major Asian economies.

The Malacca Strait, located east of the incident area, serves as the chokepoint linking the Indian Ocean with the South China Sea and is therefore essential to regional economic stability.

For Southeast Asian nations including Malaysia, Indonesia, and Singapore, instability in the Indian Ocean could translate into higher shipping insurance premiums and increased energy transport costs.

Defence planners in Kuala Lumpur and Jakarta may therefore closely monitor developments to assess potential impacts on maritime security strategies.

The confrontation also raises broader questions about the presence of major naval powers operating near critical commercial shipping routes.

India, which maintains a substantial naval presence in the Indian Ocean, may increase surveillance operations to safeguard maritime traffic.

China, whose energy imports rely heavily on these same sea lanes, may likewise evaluate the strategic implications for its regional maritime interests.

The incident therefore underscores how localised military engagements can generate far-reaching consequences for global maritime security.

Sri Lanka’s Strategic Dilemma in a Great-Power Naval Clash

Sri Lanka has found itself unexpectedly at the centre of a major naval confrontation despite maintaining a non-aligned foreign policy posture.

The sinking occurred near the southern port city of Galle, placing the country in the difficult position of managing humanitarian rescue efforts while navigating sensitive diplomatic pressures.

Sri Lankan naval vessels reportedly responded to distress signals from the sinking Iranian frigate and conducted rescue operations in the surrounding waters.

The recovery of surviving sailors and their transfer to hospitals in Galle demonstrates Colombo’s commitment to humanitarian obligations even amid geopolitical tensions.

However, the incident also highlights the vulnerability of smaller states located near critical maritime transit routes where great-power competition increasingly unfolds.

Sri Lanka’s economic ties with both Western nations and Iran further complicate its diplomatic balancing act.

The government’s confirmation of the sinking while maintaining transparency about casualty figures reflects a careful attempt to manage international scrutiny.

At the same time, Sri Lankan authorities must address the environmental and security consequences of a warship sinking in waters near vital shipping routes.

The country’s response will likely be studied as a case example of how non-aligned states manage crises triggered by major-power military operations.

The sinking of the IRIS Dana and the simultaneous targeting of the IRIS Shahid Sayyad Shirazi represent a defining moment in modern naval warfare because they demonstrate how undersea dominance can decisively reshape maritime conflict dynamics.

For global defence analysts and policymakers, the incident offers a stark reminder that submarines remain the most lethal instruments of naval power projection in contested maritime theatres.

As Operation Epic Fury continues to unfold, the Indian Ocean has emerged as a critical arena in the evolving confrontation between the United States and Iran.

Whether Tehran chooses retaliation through missiles, proxy forces, or diplomatic manoeuvring remains uncertain, but the strategic shock generated by the submarine strike has already altered the regional security landscape.

For maritime strategists across Asia, Europe, and the Middle East, the message delivered beneath the waters off Sri Lanka is unmistakable: control of the undersea domain remains the ultimate determinant of naval power in the twenty-first century.