Ripple Rock (before 1958)

URI: https://gptkb.org/entity/Ripple_Rock_(before_1958)

GPTKB entity

Predicate	Object
gptkbp:instanceOf	gptkb:underwater_mountain
gptkbp:affectedWaterway	gptkb:Discovery_Passage
gptkbp:cause	numerous shipwrecks loss of life
gptkbp:explosionAmount	1,375 tons of Nitramex 2H explosives
gptkbp:explosionDate	April 5, 1958
gptkbp:explosionPurpose	improve marine safety
gptkbp:explosionSignificance	one of the largest non-nuclear explosions in history
gptkbp:explosionType	controlled demolition
gptkbp:featureType	submerged twin-peak mountain
gptkbp:firstSurveyedYear	1792
gptkbp:knownFor	strong tidal currents hazardous navigation
gptkbp:locatedIn	gptkb:British_Columbia gptkb:Canada gptkb:Seymour_Narrows
gptkbp:maximumDepth	2.7 meters at low tide (before 1958)
gptkbp:notableEvent	destroyed by explosion in 1958
gptkbp:numberOfLocations	2
gptkbp:peakNames	gptkb:North_Peak gptkb:South_Peak
gptkbp:removalProjectBy	gptkb:Government_of_India
gptkbp:removalProjectEnd	1958
gptkbp:removalProjectStart	1942
gptkbp:removalTunnelLength	500 meters (approximate)
gptkbp:removalTunnelOrigin	gptkb:Maud_Island
gptkbp:removes	tunneling from Maud Island
gptkbp:riskFactor	shipping
gptkbp:surveyedBy	gptkb:Captain_George_Vancouver
gptkbp:bfsParent	gptkb:Seymour_Narrows
gptkbp:bfsLayer	8
http://www.w3.org/2000/01/rdf-schema#label	Ripple Rock (before 1958)