Operation Crossroads
E9207
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.
All labels observed (12)
How this entity was disambiguated
This entity first appeared as the object of triple T17967 — 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 Crossroads Context triple: [Manhattan Project, successor, Operation Crossroads]
-
A.
Manhattan Project
The Manhattan Project was the secret U.S.-led World War II research and development program that produced the first nuclear weapons.
-
B.
Operation Downfall
Operation Downfall was the Allied forces’ planned but never-executed invasion of the Japanese home islands near the end of World War II.
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C.
Operation Weser Exercise
Operation Weser Exercise was Nazi Germany’s 1940 military campaign to invade and occupy Denmark and Norway during World War II.
-
D.
atomic bombing of Nagasaki
The atomic bombing of Nagasaki was the second nuclear attack carried out by the United States against Japan in August 1945, leading to massive civilian casualties and contributing to Japan’s surrender in World War II.
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E.
Operation Neptune
Operation Neptune was the naval component of the 1944 D-Day landings, coordinating the massive Allied seaborne invasion of Nazi-occupied France during World War II.
- 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 Crossroads Target entity description: 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.
-
A.
Manhattan Project
The Manhattan Project was the secret U.S.-led World War II research and development program that produced the first nuclear weapons.
-
B.
Operation Downfall
Operation Downfall was the Allied forces’ planned but never-executed invasion of the Japanese home islands near the end of World War II.
-
C.
Operation Weser Exercise
Operation Weser Exercise was Nazi Germany’s 1940 military campaign to invade and occupy Denmark and Norway during World War II.
-
D.
atomic bombing of Nagasaki
The atomic bombing of Nagasaki was the second nuclear attack carried out by the United States against Japan in August 1945, leading to massive civilian casualties and contributing to Japan’s surrender in World War II.
-
E.
Operation Neptune
Operation Neptune was the naval component of the 1944 D-Day landings, coordinating the massive Allied seaborne invasion of Nazi-occupied France during World War II.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
United States military operation
ⓘ
nuclear weapons test series ⓘ |
| AbleDetonationHeight | airburst above target fleet ⓘ |
| AbleYield | 23 kilotons of TNT ⓘ |
| BakerDetonationDepth | underwater detonation ⓘ |
| BakerDetonationMedium | lagoon water ⓘ |
| BakerYield | 23 kilotons of TNT ⓘ |
| commander | Vice Admiral William H. P. Blandy ⓘ |
| conductedBy |
Manhattan Project personnel
ⓘ
United States Army ⓘ United States Navy ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| effectOnPopulation | displacement of Bikini Atoll inhabitants ⓘ |
| endDate | 1946-08-25 ⓘ |
| firstTestName | Able ⓘ |
| hasPart |
Test Able
ⓘ
Test Baker ⓘ Test Charlie ⓘ |
| historicalSignificance |
early demonstration of nuclear effects on naval forces
ⓘ
first peacetime nuclear weapons tests by the United States ⓘ |
| includedShip |
German heavy cruiser Prinz Eugen
ⓘ
Japanese battleship Nagato ⓘ USS Arkansas ⓘ USS Nevada ⓘ
linked to:
USS Nevada (BB-36)
USS Saratoga ⓘ |
| location |
Bikini Atoll
ⓘ
Marshall Islands ⓘ |
| notableImage | photographs of Baker underwater explosion column ⓘ |
| numberOfTargetShips | over 90 ⓘ |
| numberOfTests | 2 ⓘ |
| oversight | Joint Task Force One ⓘ |
| partOf | early Cold War nuclear testing program ⓘ |
| plannedNumberOfTests | 3 ⓘ |
| purpose |
to assess naval vulnerability to nuclear weapons
ⓘ
to study the effects of atomic bombs on military equipment ⓘ to study the effects of atomic bombs on warships ⓘ |
| result |
heavy radioactive contamination of target fleet
ⓘ
long-term contamination of Bikini Atoll ⓘ sinking of multiple target ships ⓘ |
| secondTestName | Baker ⓘ |
| startDate | 1946-07-01 ⓘ |
| statusOfTestCharlie | cancelled ⓘ |
| targetType |
auxiliary naval vessels
ⓘ
submarines ⓘ warships ⓘ |
| testType |
atmospheric nuclear test
ⓘ
underwater nuclear test ⓘ weapons effects test ⓘ |
| thirdTestName | Charlie ⓘ |
| year | 1946 ⓘ |
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 Crossroads Description of subject: 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.
Referenced by (52)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Operation Crossroads
linked to: Operation Crossroads
linked to: Operation Crossroads
linked to: Operation Crossroads
linked to: Operation Crossroads
linked to: Operation Crossroads
linked to: Operation Crossroads
linked to: Operation Crossroads
subject linked to:
BB-36
subject linked to:
BB-36
linked to: Operation Crossroads
subject linked to:
Charlie
subject linked to:
DD-411
subject linked to:
BB-33
linked to: Operation Crossroads
Nagato-class battleship
→
fateOfClassMember
→
Nagato survived World War II and was used in Operation Crossroads nuclear tests
ⓘ
linked to: Operation Crossroads
linked to: Operation Crossroads
linked to: Operation Crossroads