Tsar Bomba test site
E535299
The Tsar Bomba test site is the location on the Novaya Zemlya archipelago in the Russian Arctic where the most powerful nuclear weapon ever detonated was tested in 1961.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Novaya Zemlya Test Site | 1 |
| Tsar Bomba test site canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5648015 — 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: Tsar Bomba test site Context triple: [Novaya Zemlya, knownFor, Tsar Bomba test site]
-
A.
Semipalatinsk Test Site
The Semipalatinsk Test Site was the primary Soviet nuclear weapons testing ground, located in northeastern Kazakhstan and notorious for extensive radioactive contamination and long-term health impacts on local populations.
-
B.
Obninsk
Obninsk is a Russian city best known as the site of the world’s first grid-connected nuclear power plant and an important center for nuclear and scientific research.
-
C.
Castle Bravo
Castle Bravo was the United States’ first and most powerful dry-fuel thermonuclear (hydrogen) bomb test, conducted in 1954 and infamous for its unexpectedly massive yield and severe radioactive fallout.
-
D.
Sarov
Sarov is a closed Russian city in Nizhny Novgorod Oblast known as a major center for nuclear research and weapons development.
-
E.
Ivy Mike
Ivy Mike was the first successful full-scale test of a thermonuclear (hydrogen) bomb conducted by the United States in 1952.
- 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: Tsar Bomba test site Target entity description: The Tsar Bomba test site is the location on the Novaya Zemlya archipelago in the Russian Arctic where the most powerful nuclear weapon ever detonated was tested in 1961.
-
A.
Semipalatinsk Test Site
The Semipalatinsk Test Site was the primary Soviet nuclear weapons testing ground, located in northeastern Kazakhstan and notorious for extensive radioactive contamination and long-term health impacts on local populations.
-
B.
Obninsk
Obninsk is a Russian city best known as the site of the world’s first grid-connected nuclear power plant and an important center for nuclear and scientific research.
-
C.
Castle Bravo
Castle Bravo was the United States’ first and most powerful dry-fuel thermonuclear (hydrogen) bomb test, conducted in 1954 and infamous for its unexpectedly massive yield and severe radioactive fallout.
-
D.
Sarov
Sarov is a closed Russian city in Nizhny Novgorod Oblast known as a major center for nuclear research and weapons development.
-
E.
Ivy Mike
Ivy Mike was the first successful full-scale test of a thermonuclear (hydrogen) bomb conducted by the United States in 1952.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
geographic location
ⓘ
nuclear weapons test site ⓘ |
| accessStatus | military restricted area ⓘ |
| associatedWithEvent | Tsar Bomba nuclear test NERFINISHED ⓘ |
| climate | polar climate ⓘ |
| countryAtTimeOfTest | Soviet Union NERFINISHED ⓘ |
| currentJurisdiction | Russian Federation NERFINISHED ⓘ |
| distanceFromArcticCircle | north of Arctic Circle ⓘ |
| distanceFromNearestSettlementKilometers | about 55 ⓘ |
| environment | Arctic NERFINISHED ⓘ |
| environmentalImpact |
local radioactive contamination
ⓘ
long-term ecological monitoring concerns ⓘ |
| falloutCharacteristic | relatively low radioactive fallout for its yield ⓘ |
| geopoliticalContext |
Cold War
NERFINISHED
ⓘ
nuclear arms race between Soviet Union and United States ⓘ |
| historicalSignificance | site of the largest nuclear explosion in history ⓘ |
| locatedIn |
Novaya Zemlya archipelago
NERFINISHED
ⓘ
Russian Arctic NERFINISHED ⓘ |
| locatedInCountry | Soviet Union NERFINISHED ⓘ |
| locatedInPresentDayCountry | Russia NERFINISHED ⓘ |
| maximumFireballDiameterKilometers | about 8 ⓘ |
| mushroomCloudDiameterKilometers | about 30 ⓘ |
| mushroomCloudHeightKilometers | about 60 ⓘ |
| nearestSettlement | Dikson (approximate regional reference) NERFINISHED ⓘ |
| notableFor | detonation of the most powerful nuclear weapon ever tested ⓘ |
| operatedBy |
Soviet Union Ministry of Defense
NERFINISHED
ⓘ
Soviet nuclear weapons program ⓘ |
| partOf | Novaya Zemlya nuclear test range NERFINISHED ⓘ |
| region | Arkhangelsk Oblast NERFINISHED ⓘ |
| relatedProgram | Soviet nuclear test program on Novaya Zemlya ⓘ |
| safetyMeasure | device yield reduced from design to limit fallout ⓘ |
| securityClassificationAtTime | top secret ⓘ |
| shockwaveCircledEarthTimes | about 3 ⓘ |
| terrain | remote Arctic archipelago ⓘ |
| testAltitudeCategory | high-altitude airburst ⓘ |
| testDate | 1961-10-30 ⓘ |
| testDeliveryMethod | air-dropped bomb ⓘ |
| testDetonationHeight | approximately 4000 meters above ground ⓘ |
| testDeviceDesigners | Soviet nuclear weapons designers ⓘ |
| testDeviceName | Tsar Bomba NERFINISHED ⓘ |
| testDeviceType | three-stage thermonuclear bomb ⓘ |
| testPurpose |
demonstration of Soviet nuclear capability
ⓘ
weapons effects research ⓘ |
| testType | atmospheric nuclear test ⓘ |
| testYear | 1961 ⓘ |
| testYieldMegatonsTNT | about 50 ⓘ |
| testYieldMegatonsTNTOriginalDesign | about 100 ⓘ |
| usedFor |
nuclear weapons testing
ⓘ
thermonuclear bomb testing ⓘ |
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: Tsar Bomba test site Description of subject: The Tsar Bomba test site is the location on the Novaya Zemlya archipelago in the Russian Arctic where the most powerful nuclear weapon ever detonated was tested in 1961.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Novaya Zemlya Test Site