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US Submarine Sinks Iranian Warship IRIS Dena 40 Nautical Miles Off Sri Lanka, Killing 87 Sailors

Target:UPSC GS-IIMPSCSSC GATeachingPrelims HighMains HighStatic GK Link
05 Mar 2026
~2 min
Source: Indian Express
Key Data:40 nautical miles87 sailors killed12 nautical miles (Territorial Waters)200 nautical miles (EEZ)
Bodies:United Nations
Practice MCQs from today's news ▸
What This Article Covers

1.A US Navy submarine sank the Iranian frigate IRIS Dena about 40 nautical miles off Galle, Sri Lanka, killing 87 sailors, marking the first US submarine torpedo kill of an enemy surface vessel since WWII.

2.The incident highlights the critical legal framework of UNCLOS, differentiating Territorial Waters (12 nm, full sovereignty), EEZ (200 nm, resource rights), and International Waters/High Seas (beyond 200 nm, freedom of navigation).

3.Examiners can link this to questions on naval warfare laws, sovereignty violations, strategic chokepoints in the Indian Ocean, and the geopolitical implications of US-Iran tensions spilling into major global shipping routes.

The Big Picture
Prelims · HighMains · High

The sinking of an Iranian warship by a US submarine in waters off Sri Lanka is a high-stakes incident testing international maritime law. It forces aspirants to clearly understand the legal distinctions between Territorial Waters, Exclusive Economic Zones (EEZ), and International Waters under UNCLOS, a recurring theme in GS Paper II (IR) and Prelims.

Exam Lens

Quick Exam Facts From News

Distance from Coast40 nautical miles (74 km)
Casualties87 sailors killed
Territorial Waters Limit12 nautical miles (UNCLOS)
EEZ Limit200 nautical miles (UNCLOS)

1-Minute Revision

  • ›Distance from Coast: 40 nautical miles (74 km)
  • ›Casualties: 87 sailors killed
  • ›Target this Data: 40 nautical miles (attack distance from Galle, Sri Lanka)
  • ›Target this Nodal Body: United Nations Convention on the Law of the Sea (UNCLOS)
  • ›Target this Legal Point: 12 nm (Territorial Waters) and 200 nm (EEZ) limits under UNCLOS

Mastered this topic? Test your knowledge with a full MCQ quiz.

Practice exam-style questions, track your score, and strengthen your recall.

Q1Static LinkageEasy

The international legal framework defining maritime zones like Territorial Waters and EEZ is established by which convention?

Q2Statement-basedHard

Consider the following statements regarding maritime zones as per UNCLOS:

1. A coastal state exercises full sovereignty, similar to its land territory, within its Territorial Waters.

2. In an Exclusive Economic Zone (EEZ), foreign vessels require permission from the coastal state for navigation.

3. Waters beyond 200 nautical miles from any coast are known as International Waters or the High Seas.

Which of the statements given above is/are correct?

Q3Data-centricMedium

According to the news, how many nautical miles off the coast of Galle, Sri Lanka, did the sinking of the IRIS Dena occur?

Q4Application/ImpactMedium

Why does the location of the IRIS Dena sinking (40 nm off Sri Lanka) carry significant legal and geopolitical implications?

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