Operation Castle
E290400
Operation Castle was a series of high-yield U.S. thermonuclear weapon tests conducted in the Pacific Proving Grounds during the early Cold War.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Operation Castle canonical | 8 |
How this entity was disambiguated
This entity first appeared as the object of triple T2710371 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Operation Castle Context triple: [Enewetak Atoll, testSeriesConducted, Operation Castle]
-
A.
Operation Meetinghouse
Operation Meetinghouse was the devastating March 1945 U.S. firebombing raid on Tokyo, which became one of the most destructive air attacks in history.
-
B.
Operation Barrel Roll
Operation Barrel Roll was a covert U.S. bombing campaign conducted in Laos during the Vietnam War, aimed at disrupting North Vietnamese supply routes and supporting Royal Lao Government forces.
-
C.
Operation Tidal Wave
Operation Tidal Wave was a major World War II Allied air raid targeting Romanian oil refineries at Ploiești in an effort to cripple Nazi Germany’s fuel supplies.
-
D.
Operation Crossroads
Operation Crossroads was a series of U.S. nuclear weapons tests conducted at Bikini Atoll in 1946 to study the effects of atomic bombs on warships and military equipment.
-
E.
Operation Linebacker
Operation Linebacker was a major U.S. aerial bombing campaign conducted in 1972 against North Vietnam to disrupt its supply lines and support South Vietnamese forces.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Operation Castle Target entity description: Operation Castle was a series of high-yield U.S. thermonuclear weapon tests conducted in the Pacific Proving Grounds during the early Cold War.
-
A.
Operation Meetinghouse
Operation Meetinghouse was the devastating March 1945 U.S. firebombing raid on Tokyo, which became one of the most destructive air attacks in history.
-
B.
Operation Barrel Roll
Operation Barrel Roll was a covert U.S. bombing campaign conducted in Laos during the Vietnam War, aimed at disrupting North Vietnamese supply routes and supporting Royal Lao Government forces.
-
C.
Operation Tidal Wave
Operation Tidal Wave was a major World War II Allied air raid targeting Romanian oil refineries at Ploiești in an effort to cripple Nazi Germany’s fuel supplies.
-
D.
Operation Crossroads
Operation Crossroads was a series of U.S. nuclear weapons tests conducted at Bikini Atoll in 1946 to study the effects of atomic bombs on warships and military equipment.
-
E.
Operation Linebacker
Operation Linebacker was a major U.S. aerial bombing campaign conducted in 1972 against North Vietnam to disrupt its supply lines and support South Vietnamese forces.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
United States military operation
ⓘ
nuclear weapons test series ⓘ thermonuclear weapon test ⓘ |
| affected |
Japanese fishing vessel Daigo Fukuryu Maru
ⓘ
Rongelap Atoll ⓘ Utirik Atoll ⓘ |
| conflict | Cold War ⓘ |
| consequence | widespread radioactive fallout ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| date | 1954-03-01 ⓘ |
| design | dry-fuel lithium deuteride thermonuclear device ⓘ |
| endDate | 1954-05-14 ⓘ |
| environmentalImpact | long-term radioactive contamination in parts of the Marshall Islands ⓘ |
| followedBy | Operation Teapot ⓘ |
| location |
Bikini Atoll
ⓘ
Enewetak Atoll ⓘ Marshall Islands ⓘ |
| maximumYield | 15 megatons of TNT ⓘ |
| notableTest | Castle Bravo ⓘ |
| numberOfTests | 6 ⓘ |
| operator |
United States Atomic Energy Commission
ⓘ
United States Department of Defense ⓘ
linked to:
Department of Defense
|
| partOf |
Operation Castle
ⓘ
Pacific Proving Grounds nuclear tests ⓘ
linked to:
United States nuclear weapons testing
|
| politicalImpact | increased international concern over atmospheric nuclear testing ⓘ |
| precededBy | Operation Ivy ⓘ |
| purpose |
development of deliverable thermonuclear weapons
ⓘ
evaluation of dry-fuel hydrogen bomb designs ⓘ |
| significance | first U.S. test of a practical deliverable hydrogen bomb ⓘ |
| startDate | 1954-03-01 ⓘ |
| status | completed ⓘ |
| testedBy |
Los Alamos National Laboratory
ⓘ
linked to:
Los Alamos Laboratory
University of California Radiation Laboratory ⓘ
linked to:
Radiation Laboratory
|
| testedDeviceType |
three-stage thermonuclear device
ⓘ
two-stage thermonuclear device ⓘ |
| testName |
Castle Bravo
ⓘ
Castle Koon ⓘ Castle Nectar ⓘ Castle Romeo ⓘ Castle Union ⓘ Castle Yankee ⓘ |
| testType |
atmospheric nuclear test
ⓘ
thermonuclear weapon test ⓘ |
| yield |
15 megatons of TNT
ⓘ
15000000 tons of TNT ⓘ |
| yieldClass | high-yield ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Operation Castle Description of subject: Operation Castle was a series of high-yield U.S. thermonuclear weapon tests conducted in the Pacific Proving Grounds during the early Cold War.
Referenced by (8)
Full triples — surface form annotated when it differs from this entity's canonical label.