sinking of SF Hydro
E600611
The sinking of SF Hydro was a World War II operation in which Norwegian resistance fighters destroyed a ferry carrying heavy water to disrupt Nazi Germany’s atomic research program.
All labels observed (1)
| Label | Occurrences |
|---|---|
| sinking of SF Hydro canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T6502751 — 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: sinking of SF Hydro Context triple: [Norwegian heavy water sabotage, hasPart, sinking of SF Hydro]
-
A.
BSF Water Wing
BSF Water Wing is the marine component of India’s Border Security Force responsible for patrolling and securing the country’s riverine and coastal borders.
-
B.
CSS Hunley
CSS Hunley was a Confederate Civil War submarine best known as the first combat submarine to sink an enemy warship.
-
C.
M/V Lituya
M/V Lituya is a small Alaska Marine Highway System ferry that primarily serves short-haul routes in Southeast Alaska.
-
D.
ROV Kaikō
ROV Kaikō was a Japanese remotely operated deep-sea research vehicle renowned for reaching and studying the deepest parts of the world’s oceans.
-
E.
MV Puyallup
MV Puyallup is a large Jumbo Mark II-class passenger and vehicle ferry operating in the Washington State Ferries system, primarily serving busy routes in the Puget Sound region.
- 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: sinking of SF Hydro Target entity description: The sinking of SF Hydro was a World War II operation in which Norwegian resistance fighters destroyed a ferry carrying heavy water to disrupt Nazi Germany’s atomic research program.
-
A.
BSF Water Wing
BSF Water Wing is the marine component of India’s Border Security Force responsible for patrolling and securing the country’s riverine and coastal borders.
-
B.
CSS Hunley
CSS Hunley was a Confederate Civil War submarine best known as the first combat submarine to sink an enemy warship.
-
C.
M/V Lituya
M/V Lituya is a small Alaska Marine Highway System ferry that primarily serves short-haul routes in Southeast Alaska.
-
D.
ROV Kaikō
ROV Kaikō was a Japanese remotely operated deep-sea research vehicle renowned for reaching and studying the deepest parts of the world’s oceans.
-
E.
MV Puyallup
MV Puyallup is a large Jumbo Mark II-class passenger and vehicle ferry operating in the Washington State Ferries system, primarily serving busy routes in the Puget Sound region.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
World War II military operation
ⓘ
sabotage operation ⓘ |
| aftermath | German efforts to obtain heavy water from Norway largely ended ⓘ |
| alsoKnownAs |
sabotage of the ferry SF Hydro
ⓘ
sinking of the ferry Hydro ⓘ |
| belligerent |
Nazi Germany
ⓘ
Norwegian resistance ⓘ
linked to:
Norwegian resistance movement
|
| bodyOfWater | Tinnsjø ⓘ |
| carried |
heavy water
ⓘ
railway wagons ⓘ |
| carriedFor |
German nuclear program
ⓘ
linked to:
German nuclear energy project (Uranverein)
|
| carriedOutBy |
Norwegian saboteurs
ⓘ
linked to:
Norwegian heavy water sabotage
members of the Norwegian resistance in Telemark ⓘ |
| casualties |
German personnel killed
ⓘ
Norwegian civilians killed ⓘ |
| category |
World War II operations involving Norway
ⓘ
naval incidents in 1944 ⓘ operations against the German nuclear program ⓘ |
| conflict | World War II ⓘ |
| coordinatedBy | Norwegian resistance movement ⓘ |
| country | Norway ⓘ |
| date | 1944-02-20 ⓘ |
| hasSubject |
Allied efforts to stop Nazi nuclear development
ⓘ
Norwegian resistance in World War II ⓘ
linked to:
Norwegian resistance movement
|
| location | Telemark ⓘ |
| method | sabotage with explosives ⓘ |
| motivation | prevent Nazi Germany from acquiring strategic heavy water supplies ⓘ |
| objective |
disrupt Nazi Germany’s atomic research program
ⓘ
prevent transport of heavy water to Germany ⓘ |
| operatorOfTargetVessel |
Norsk Hydro
ⓘ
linked to:
Norsk Hydro (historically)
|
| opponent |
German authorities in occupied Norway
ⓘ
linked to:
Reichskommissariat Norwegen
|
| partOf | Norwegian heavy water sabotage ⓘ |
| place | Lake Tinn ⓘ |
| precededBy | sabotage of Vemork heavy water plant ⓘ |
| relatedTo |
Vemork heavy water plant
ⓘ
linked to:
Vemork
|
| result |
German nuclear program hindered
ⓘ
SF Hydro sunk ⓘ cargo of heavy water lost ⓘ |
| significance |
important episode in the history of nuclear weapons development
ⓘ
key action in preventing Nazi access to heavy water ⓘ |
| supportedBy | Allied intelligence ⓘ |
| target | SF Hydro ⓘ |
| transportRouteDisrupted | Vemork to Germany heavy water route ⓘ |
| vesselTypeOfTarget | railway ferry ⓘ |
| weaponUsed | time bomb ⓘ |
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: sinking of SF Hydro Description of subject: The sinking of SF Hydro was a World War II operation in which Norwegian resistance fighters destroyed a ferry carrying heavy water to disrupt Nazi Germany’s atomic research program.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.