Greywell Tunnel
E617608
Greywell Tunnel is a disused, bat-inhabited canal tunnel in Hampshire, England, notable as the former western terminus of the Basingstoke Canal and a protected wildlife site.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Greywell Tunnel canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T6766871 — 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: Greywell Tunnel Context triple: [Basingstoke Canal, hasFeature, Greywell Tunnel]
-
A.
Bruce Tunnel
Bruce Tunnel is a historic canal tunnel in Wiltshire, England, carrying the Kennet and Avon Canal beneath Savernake Forest.
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B.
Malpas Tunnel
Malpas Tunnel is a historic canal tunnel in southern France, notable as one of the first navigable tunnels built for the Canal du Midi in the 17th century.
-
C.
Jack Lynch Tunnel
The Jack Lynch Tunnel is a major underwater road tunnel in Cork, Ireland, carrying vehicular traffic beneath the River Lee estuary as part of the city’s ring road network.
-
D.
Cosgrove Tunnel
Cosgrove Tunnel is a major water-supply conduit in Massachusetts that carries drinking water from the Wachusett Reservoir toward the Boston metropolitan area.
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E.
Mountfield Tunnel
Mountfield Tunnel is a railway tunnel in East Sussex, England, carrying the Tonbridge–Hastings line through the countryside near the village of Mountfield.
- 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: Greywell Tunnel Target entity description: Greywell Tunnel is a disused, bat-inhabited canal tunnel in Hampshire, England, notable as the former western terminus of the Basingstoke Canal and a protected wildlife site.
-
A.
Bruce Tunnel
Bruce Tunnel is a historic canal tunnel in Wiltshire, England, carrying the Kennet and Avon Canal beneath Savernake Forest.
-
B.
Malpas Tunnel
Malpas Tunnel is a historic canal tunnel in southern France, notable as one of the first navigable tunnels built for the Canal du Midi in the 17th century.
-
C.
Jack Lynch Tunnel
The Jack Lynch Tunnel is a major underwater road tunnel in Cork, Ireland, carrying vehicular traffic beneath the River Lee estuary as part of the city’s ring road network.
-
D.
Cosgrove Tunnel
Cosgrove Tunnel is a major water-supply conduit in Massachusetts that carries drinking water from the Wachusett Reservoir toward the Boston metropolitan area.
-
E.
Mountfield Tunnel
Mountfield Tunnel is a railway tunnel in East Sussex, England, carrying the Tonbridge–Hastings line through the countryside near the village of Mountfield.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
Site of Special Scientific Interest
ⓘ
bat roost ⓘ canal tunnel ⓘ disused transport infrastructure ⓘ |
| access | public access prohibited inside tunnel ⓘ |
| collapseDate | 1932 ⓘ |
| connects | Greywell with the western section of the Basingstoke Canal ⓘ |
| constructionStart | late 18th century ⓘ |
| country | United Kingdom ⓘ |
| designatedAsSSSIDate | 1975 ⓘ |
| ecologicalSignificance |
important breeding site for bats
ⓘ
important hibernation site for bats ⓘ |
| endPoint | near Mapledurwell, Hampshire ⓘ |
| entranceVisibility |
eastern portal visible
ⓘ
western portal blocked by collapse ⓘ |
| function | former navigation route for barges ⓘ |
| hasSpecies |
Brandt’s bat
ⓘ
Daubenton’s bat ⓘ Natterer’s bat ⓘ brown long-eared bat ⓘ whiskered bat ⓘ |
| hasStructure | towpath tunnel at eastern end ⓘ |
| heritageDesignation | Site of Special Scientific Interest ⓘ |
| knownFor |
being western terminus of the Basingstoke Canal
ⓘ
large bat colony ⓘ undisturbed underground habitat ⓘ |
| length |
approximately 1,215 yards
ⓘ
approximately 1,230 metres ⓘ |
| locatedIn |
Basingstoke Canal
ⓘ
England ⓘ Hampshire ⓘ village of Greywell ⓘ |
| managedBy |
Natural England (for SSSI aspects)
ⓘ
linked to:
Natural England
|
| navigationStatus | closed to boats ⓘ |
| nearbyFeature |
Greywell Moors
ⓘ
River Whitewater ⓘ |
| openingDate | 1794 ⓘ |
| owner | Basingstoke Canal Authority ⓘ |
| partOf | Basingstoke Canal ⓘ |
| protectedFor |
bat populations
ⓘ
wildlife conservation ⓘ |
| region | South East England ⓘ |
| startPoint | Greywell, Hampshire ⓘ |
| status |
collapsed
ⓘ
disused ⓘ |
| tunnelType | brick-lined canal tunnel ⓘ |
| waterway | Basingstoke Canal ⓘ |
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: Greywell Tunnel Description of subject: Greywell Tunnel is a disused, bat-inhabited canal tunnel in Hampshire, England, notable as the former western terminus of the Basingstoke Canal and a protected wildlife site.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.