Baker (Operation Crossroads)
E325568
Baker (Operation Crossroads) was the second of the 1946 Operation Crossroads nuclear tests at Bikini Atoll, notable for being an underwater detonation that dramatically showcased the effects of nuclear weapons on naval ships and the environment.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Baker (Operation Crossroads) canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3075820 — 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: Baker (Operation Crossroads) Context triple: [Charlie (Operation Crossroads), precededBy, Baker (Operation Crossroads)]
-
A.
Bockscar
Bockscar was the U.S. Army Air Forces B-29 Superfortress bomber that dropped the "Fat Man" nuclear weapon on Nagasaki during World War II.
-
B.
USS Pampanito
USS Pampanito is a World War II-era Balao-class submarine preserved as a museum ship and memorial in San Francisco.
-
C.
Guardbridge
Guardbridge is a small Scottish village in Fife, situated near the River Eden and known historically for its paper mill and as a gateway to St Andrews.
-
D.
Fletcher
Fletcher is a surname of English origin borne by numerous notable individuals across fields such as the military, politics, arts, and sports.
-
E.
U-505 submarine
The U-505 submarine is a captured German World War II U-boat preserved as a historic naval artifact and war prize.
- 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: Baker (Operation Crossroads) Target entity description: Baker (Operation Crossroads) was the second of the 1946 Operation Crossroads nuclear tests at Bikini Atoll, notable for being an underwater detonation that dramatically showcased the effects of nuclear weapons on naval ships and the environment.
-
A.
Bockscar
Bockscar was the U.S. Army Air Forces B-29 Superfortress bomber that dropped the "Fat Man" nuclear weapon on Nagasaki during World War II.
-
B.
USS Pampanito
USS Pampanito is a World War II-era Balao-class submarine preserved as a museum ship and memorial in San Francisco.
-
C.
Guardbridge
Guardbridge is a small Scottish village in Fife, situated near the River Eden and known historically for its paper mill and as a gateway to St Andrews.
-
D.
Fletcher
Fletcher is a surname of English origin borne by numerous notable individuals across fields such as the military, politics, arts, and sports.
-
E.
U-505 submarine
The U-505 submarine is a captured German World War II U-boat preserved as a historic naval artifact and war prize.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
nuclear weapons test
ⓘ
underwater nuclear test ⓘ |
| associatedHazard |
neutron activation of seawater and ship materials
ⓘ
radioactive base surge ⓘ |
| codename | Baker ⓘ |
| comparisonWithAble | produced greater long-term contamination than Able ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| date | 1946-07-25 ⓘ |
| depthOfDetonation |
approximately 27 meters
ⓘ
approximately 90 feet ⓘ |
| detonationMedium | underwater ⓘ |
| deviceType | plutonium implosion device ⓘ |
| environmentalImpact |
contamination of Bikini lagoon waters and sediments
ⓘ
radioactive fallout on nearby ships and structures ⓘ |
| followedBy | Charlie (Operation Crossroads) ⓘ |
| historicalSignificance |
demonstrated challenges of decontaminating irradiated ships
ⓘ
first large-scale underwater nuclear explosion test on a fleet ⓘ |
| impactOnPolicy | influenced later nuclear test safety procedures ⓘ |
| impactOnScience | provided data on underwater blast effects and radiological contamination ⓘ |
| location |
Bikini Atoll
ⓘ
Marshall Islands ⓘ |
| notableEffect |
heavy radioactive contamination of target ships
ⓘ
long-lasting radiological hazard in lagoon ⓘ massive water column and base surge ⓘ |
| numberOfTargetShips | approximately 90 ⓘ |
| observationMethod |
aerial photography
ⓘ
high-speed cameras ⓘ instrumented target ships ⓘ |
| operator |
Manhattan Project
ⓘ
United States Army ⓘ United States Navy ⓘ |
| partOf | Operation Crossroads ⓘ |
| partOfProgram | early postwar U.S. nuclear testing program ⓘ |
| precededBy | Able (Operation Crossroads) ⓘ |
| purpose |
to study the effects of nuclear weapons on naval vessels
ⓘ
to study the radiological effects of underwater nuclear detonations ⓘ |
| result |
severe damage to many surviving ships
ⓘ
sinking of multiple target vessels ⓘ |
| targetType | naval ships ⓘ |
| testEnvironment |
Bikini Atoll lagoon
ⓘ
surface form:
lagoon of Bikini Atoll
|
| testGeometry | shallow underwater burst beneath target fleet ⓘ |
| testNumberInSeries | second test of Operation Crossroads ⓘ |
| testSeries | Operation Crossroads ⓘ |
| testStatus | completed ⓘ |
| testType | weapons effects test ⓘ |
| time | 08:35 local time ⓘ |
| year | 1946 ⓘ |
| yield | 23 kilotons of TNT ⓘ |
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: Baker (Operation Crossroads) Description of subject: Baker (Operation Crossroads) was the second of the 1946 Operation Crossroads nuclear tests at Bikini Atoll, notable for being an underwater detonation that dramatically showcased the effects of nuclear weapons on naval ships and the environment.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Charlie (Operation Crossroads)