 In contrast, the Northern Explorer Ridge has evolved into a complex compound structure consisting of several rift basins bounded by half-graben and arcuate shaped faults with a superimposed pattern of rhombohedral grabens and horsts.The Endeavour Segment, an active rift zone of the larger Juan de Fuca Ridge on the British Columbia Coast, contains a group of active black smokers called the Endeavour Hydrothermal Vents, located southwest of Vancouver Island.This group of hydrothermal vents lies below sea level and consists of five hydrothermal fields, known as "Sasquatch", "Saily Dawg", "High Rise", "Mothra", and "Main Endeavour".