Portsmouth Naval Shipyard
E112461
Portsmouth Naval Shipyard is a historic U.S. Navy shipbuilding and repair facility located in Kittery, Maine, known especially for constructing and overhauling naval vessels including submarines.
All labels observed (7)
How this entity was disambiguated
This entity first appeared as the object of triple T948954 — 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: Portsmouth Naval Shipyard Context triple: [USS Ranger, builtAt, Portsmouth Naval Shipyard]
-
A.
Portsmouth Naval Base
Portsmouth Naval Base is a major Royal Navy dockyard and headquarters on England’s south coast, serving as one of the UK’s principal naval facilities.
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B.
Mare Island Naval Shipyard
Mare Island Naval Shipyard was a major U.S. Navy shipbuilding and repair facility in Vallejo, California, notable as one of the first permanent naval shipyards on the West Coast.
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C.
Pearl Harbor Naval Shipyard
Pearl Harbor Naval Shipyard is a major U.S. Navy industrial facility in Hawaii that provides maintenance, repair, and modernization services for naval vessels and submarines.
-
D.
Augusta Naval Base
Augusta Naval Base is a major Italian naval installation in Sicily that serves as a strategic hub for fleet operations and logistics in the central Mediterranean.
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E.
Treasure Island Naval Station (former)
Treasure Island Naval Station (former) was a decommissioned U.S. Navy base located on San Francisco Bay’s man-made Treasure Island, historically used for training, administration, and support operations.
- 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: Portsmouth Naval Shipyard Target entity description: Portsmouth Naval Shipyard is a historic U.S. Navy shipbuilding and repair facility located in Kittery, Maine, known especially for constructing and overhauling naval vessels including submarines.
-
A.
Portsmouth Naval Base
Portsmouth Naval Base is a major Royal Navy dockyard and headquarters on England’s south coast, serving as one of the UK’s principal naval facilities.
-
B.
Mare Island Naval Shipyard
Mare Island Naval Shipyard was a major U.S. Navy shipbuilding and repair facility in Vallejo, California, notable as one of the first permanent naval shipyards on the West Coast.
-
C.
Pearl Harbor Naval Shipyard
Pearl Harbor Naval Shipyard is a major U.S. Navy industrial facility in Hawaii that provides maintenance, repair, and modernization services for naval vessels and submarines.
-
D.
Augusta Naval Base
Augusta Naval Base is a major Italian naval installation in Sicily that serves as a strategic hub for fleet operations and logistics in the central Mediterranean.
-
E.
Treasure Island Naval Station (former)
Treasure Island Naval Station (former) was a decommissioned U.S. Navy base located on San Francisco Bay’s man-made Treasure Island, historically used for training, administration, and support operations.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
United States Navy shipyard
ⓘ
military installation ⓘ submarine shipyard ⓘ |
| adjacentTo | Portsmouth Harbor ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| employs |
civilian workforce
ⓘ
military personnel ⓘ |
| established | 1800 ⓘ |
| establishedBy |
United States Congress
ⓘ
surface form:
U.S. Congress
United States government ⓘ
surface form:
United States federal government
|
| governedBy | U.S. federal law ⓘ |
| hasAlternateName |
Portsmouth Naval Shipyard
ⓘ
surface form:
Portsmouth Navy Yard
|
| hasFunction |
engineering support
ⓘ
logistics support ⓘ ship repair ⓘ shipbuilding ⓘ |
| hasHeritageStatus | historic naval facility ⓘ |
| hasInfrastructure |
dry docks
ⓘ
industrial facilities ⓘ piers ⓘ |
| hasJurisdiction | federal enclave ⓘ |
| historicalRole |
construction of U.S. Navy submarines
ⓘ
overhaul of naval vessels ⓘ |
| listedAs | Superfund site ⓘ |
| locatedIn |
Kittery, Maine
NERFINISHED
ⓘ
East Coast of the United States ⓘ
surface form:
United States East Coast
York County, Maine ⓘ Maine ⓘ
surface form:
state of Maine
|
| locatedNear | Portsmouth, New Hampshire ⓘ |
| locatedOn |
Piscataqua River
ⓘ
Seavey Island ⓘ |
| nearBorderWith | New Hampshire ⓘ |
| notableFor |
Cold War submarine work
ⓘ
World War II submarine construction ⓘ nuclear-powered submarine overhaul ⓘ |
| oneOfOldest | United States Navy shipyards ⓘ |
| operator | United States Navy ⓘ |
| ownedBy |
Department of the Navy
ⓘ
surface form:
United States Department of the Navy
|
| partOf | Naval Sea Systems Command ⓘ |
| primaryMission | maintenance of U.S. Navy attack submarines ⓘ |
| regionServed |
Atlantic Fleet
ⓘ
surface form:
U.S. Atlantic Fleet
|
| specializesIn |
submarine construction
ⓘ
submarine modernization ⓘ submarine overhaul ⓘ submarine repair ⓘ |
| supportsVesselType |
Los Angeles-class submarines
ⓘ
Virginia-class submarine ⓘ
surface form:
Virginia-class submarines
|
| timeZone | Eastern Time Zone ⓘ |
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: Portsmouth Naval Shipyard Description of subject: Portsmouth Naval Shipyard is a historic U.S. Navy shipbuilding and repair facility located in Kittery, Maine, known especially for constructing and overhauling naval vessels including submarines.
Referenced by (20)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Naval Shipyards
this entity surface form:
Portsmouth Navy Yard
this entity surface form:
Portsmouth Naval Shipyard (in Kittery, Maine across the river)
this entity surface form:
Portsmouth Navy Yard
subject surface form:
USS Pampanito (SS-383)
this entity surface form:
Portsmouth Navy Yard
this entity surface form:
Portsmouth Naval Shipyard (nearby, across river in Maine)
this entity surface form:
Portsmouth Naval Shipyard (nearby, across river in Kittery, Maine)
this entity surface form:
Portsmouth Naval Shipyard Historic District