Blue Hole (Dahab)
E303574
Blue Hole (Dahab) is a famous and notoriously challenging marine sinkhole and dive site off the coast of Dahab in Egypt’s Red Sea, known for its deep vertical drop, rich coral life, and history of technical diving accidents.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Blue Hole (Dahab) canonical | 1 |
| Blue Hole (dive site) | 1 |
| Blue Hole area of Dahab | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2843709 — 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: Blue Hole (Dahab) Context triple: [Dahab, hasNearbyAttraction, Blue Hole (Dahab)]
-
A.
Benagil Cave
Benagil Cave is a famous seaside grotto in Portugal known for its dramatic domed ceiling, natural skylight, and golden-sand beach accessible mainly by boat or kayak.
-
B.
Cave of Swimmers
The Cave of Swimmers is a prehistoric rock art site in Egypt’s remote Gilf Kebir plateau, famed for its Neolithic paintings of human figures that suggest a once wetter, habitable Sahara.
-
C.
Ras Mohammed National Park
Ras Mohammed National Park is a renowned marine and terrestrial protected area at the southern tip of the Sinai Peninsula in Egypt, famous for its rich coral reefs, diverse marine life, and dramatic desert landscapes.
-
D.
Wadi Rum
Wadi Rum is a vast desert valley in southern Jordan known for its dramatic sandstone mountains, red sand dunes, and use as a filming location for Mars-like landscapes.
-
E.
Bahariya Oasis
Bahariya Oasis is a fertile depression in Egypt’s Western Desert known for its date palms, hot springs, archaeological sites, and as a gateway to the surrounding Black and White Deserts.
- 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: Blue Hole (Dahab) Target entity description: Blue Hole (Dahab) is a famous and notoriously challenging marine sinkhole and dive site off the coast of Dahab in Egypt’s Red Sea, known for its deep vertical drop, rich coral life, and history of technical diving accidents.
-
A.
Benagil Cave
Benagil Cave is a famous seaside grotto in Portugal known for its dramatic domed ceiling, natural skylight, and golden-sand beach accessible mainly by boat or kayak.
-
B.
Cave of Swimmers
The Cave of Swimmers is a prehistoric rock art site in Egypt’s remote Gilf Kebir plateau, famed for its Neolithic paintings of human figures that suggest a once wetter, habitable Sahara.
-
C.
Ras Mohammed National Park
Ras Mohammed National Park is a renowned marine and terrestrial protected area at the southern tip of the Sinai Peninsula in Egypt, famous for its rich coral reefs, diverse marine life, and dramatic desert landscapes.
-
D.
Wadi Rum
Wadi Rum is a vast desert valley in southern Jordan known for its dramatic sandstone mountains, red sand dunes, and use as a filming location for Mars-like landscapes.
-
E.
Bahariya Oasis
Bahariya Oasis is a fertile depression in Egypt’s Western Desert known for its date palms, hot springs, archaeological sites, and as a gateway to the surrounding Black and White Deserts.
- F. None of above. chosen
Statements (67)
| Predicate | Object |
|---|---|
| instanceOf |
dive site
ⓘ
marine sinkhole ⓘ underwater cave system ⓘ |
| accessFrom | Dahab by road ⓘ |
| approximateDepth | about 100 meters ⓘ |
| archDepthAtBottom | about 120 meters ⓘ |
| archDepthAtRoof | about 52 to 56 meters ⓘ |
| archLength | about 26 meters ⓘ |
| bestKnownSection | the Arch ⓘ |
| connectsTo | open sea via the Arch ⓘ |
| continent | Africa ⓘ |
| country | Egypt ⓘ |
| distanceFromDahab | about 8 kilometers north ⓘ |
| diveType | shore dive ⓘ |
| ecosystem | coral reef ecosystem ⓘ |
| entryType | shore entry ⓘ |
| feature |
blue water column
ⓘ
coral reef walls ⓘ saddle at reef edge ⓘ sheer drop-off ⓘ submerged archway ⓘ vertical sinkhole ⓘ |
| formationProcess | dissolution of limestone and reef structures ⓘ |
| geologicalType | karst sinkhole ⓘ |
| hasPart |
the Arch
ⓘ
the Saddle ⓘ |
| hasReputation |
divers cemetery
ⓘ
one of the most dangerous dive sites in the world ⓘ |
| hazard |
decompression obligation
ⓘ
depth beyond recreational limits ⓘ disorientation in the Arch ⓘ overhead environment in the Arch ⓘ oxygen toxicity risk on inappropriate gas mixes ⓘ strong gas narcosis at depth ⓘ |
| knownFor |
abundant reef fish
ⓘ
challenging dive profiles ⓘ clear visibility ⓘ decompression sickness incidents ⓘ deep diving ⓘ freediving records ⓘ high number of diver fatalities ⓘ nitrogen narcosis risk ⓘ rich coral life ⓘ technical diving ⓘ wall diving ⓘ |
| locatedIn | Red Sea ⓘ |
| locatedInGovernorate | South Sinai Governorate ⓘ |
| locatedInRegion | Gulf of Aqaba ⓘ |
| locatedNear | Dahab ⓘ |
| locatedOnCoastOf | Sinai Peninsula ⓘ |
| marineLife |
hard corals
ⓘ
pelagic species near the Arch ⓘ reef fish ⓘ soft corals ⓘ |
| maximumDepth | over 100 meters ⓘ |
| nearestTown | Dahab ⓘ |
| popularWith |
experienced recreational divers
ⓘ
freedivers ⓘ technical divers ⓘ |
| regulation | local dive centers impose depth limits for recreational divers ⓘ |
| saddleDepth | about 6 meters ⓘ |
| tourismActivity |
freediving
ⓘ
scuba diving ⓘ snorkeling ⓘ |
| visibility | often 20 to 30 meters or more ⓘ |
| waterBody | Gulf of Aqaba ⓘ |
| waterType | saltwater ⓘ |
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: Blue Hole (Dahab) Description of subject: Blue Hole (Dahab) is a famous and notoriously challenging marine sinkhole and dive site off the coast of Dahab in Egypt’s Red Sea, known for its deep vertical drop, rich coral life, and history of technical diving accidents.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Blue Hole (dive site)