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Topic 142 · Defence & Security

IRIS Dena sunk off Sri Lanka

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Revise the 12 points first Book 1 RATNA
  1. Core Trigger: On 4 March 2026 USS Charlotte torpedoed and sank the Iranian frigate IRIS Dena about 19 nautical miles off Galle, Sri Lanka; over eighty died.
  2. India Link: The frigate was sailing home from India's MILAN 2026 exercise and International Fleet Review at Visakhapatnam.
  3. Key Platform: A US AH-64 Apache was downed near Hormuz; India operates 28 AH-64E Apaches.
  4. Air Defence: Iran's Arash-e Kamangir air defence reportedly downed a US MQ-9 Reaper drone.
  5. Historic First: It was the first time since the Second World War that a US submarine sank a warship with torpedoes.
  6. Stakeholders: Iran's IRGC Mosquito Fleet of fast boats and naval mines threatened shipping; USS Abraham Lincoln is a Nimitz-class carrier.
  7. Regional Impact: The sinking occurred in the Indian Ocean, near India, days after the visit.
  8. Venue: Galle waters, Sri Lanka; Hormuz links the Persian Gulf with the Gulf of Oman.
  9. Founded: Iran's Islamic Revolutionary Guard Corps (IRGC) was formed in 1979 after the Islamic Revolution.
  10. Landmark: The UN Charter (1945) bars the use of force in Article 2(4), with self-defence preserved by Article 51.
  11. Articles: Article 38 of UNCLOS gives ships the right of transit passage through straits used for international navigation.
  12. Doctrine: Under Article 95 of UNCLOS, warships on the high seas enjoy complete immunity from other states' jurisdiction.
Question 1 of 10

Which US submarine sank the Iranian frigate IRIS Dena off Galle, Sri Lanka, on 4 March 2026?

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Answer: (C) USS Charlotte

Core Trigger: On 4 March 2026 USS Charlotte torpedoed and sank the Iranian frigate IRIS Dena about 19 nautical miles off Galle, Sri Lanka; over eighty died.From Book 1 RATNA, topic 142, point 1

Question 2 of 10

IRIS Dena was sailing home from which Indian event when it was sunk?

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Answer: (C) MILAN 2026 and International Fleet Review

India Link: The frigate was sailing home from India's MILAN 2026 exercise and International Fleet Review at Visakhapatnam.From Book 1 RATNA, topic 142, point 2

Question 3 of 10

How many AH-64E Apaches does India operate?

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Answer: (C) 28

Key Platform: A US AH-64 Apache was downed near Hormuz; India operates 28 AH-64E Apaches.From Book 1 RATNA, topic 142, point 3

Question 4 of 10

Which Iranian air defence system reportedly downed a US MQ-9 Reaper drone?

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Answer: (C) Arash-e Kamangir

Air Defence: Iran's Arash-e Kamangir air defence reportedly downed a US MQ-9 Reaper drone.From Book 1 RATNA, topic 142, point 4

Question 5 of 10

The sinking was the first time since which war that a US submarine sank a warship with torpedoes?

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Answer: (B) Second World War

Historic First: It was the first time since the Second World War that a US submarine sank a warship with torpedoes.From Book 1 RATNA, topic 142, point 5

Question 6 of 10

USS Abraham Lincoln belongs to which class of aircraft carrier?

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Answer: (C) Nimitz-class

Stakeholders: Iran's IRGC Mosquito Fleet of fast boats and naval mines threatened shipping; USS Abraham Lincoln is a Nimitz-class carrier.From Book 1 RATNA, topic 142, point 6

Question 7 of 10

The Strait of Hormuz links the Persian Gulf with which waterbody?

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Answer: (C) Gulf of Oman

Venue: Galle waters, Sri Lanka; Hormuz links the Persian Gulf with the Gulf of Oman.From Book 1 RATNA, topic 142, point 8

Question 8 of 10

In which year was Iran's Islamic Revolutionary Guard Corps (IRGC) formed?

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Answer: (C) 1979

Founded: Iran's Islamic Revolutionary Guard Corps (IRGC) was formed in 1979 after the Islamic Revolution.From Book 1 RATNA, topic 142, point 9

Question 9 of 10

Which provision of the UN Charter bars the use of force?

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Answer: (D) Article 2(4)

Landmark: The UN Charter (1945) bars the use of force in Article 2(4), with self-defence preserved by Article 51.From Book 1 RATNA, topic 142, point 10

Question 10 of 10

Consider UNCLOS. 1. Article 38 bars passage through straits used for international navigation. 2. Article 95 gives warships on the high seas complete immunity from other states' jurisdiction. Which is/are correct?

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Answer: (B) Only 2

Articles: Article 38 of UNCLOS gives ships the right of transit passage through straits used for international navigation.From Book 1 RATNA, topic 142, point 11

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