Before revision: The demonstration of the viability of sea floor observations by submersibles made possible the subsequent discoveries of hydrothermal vents at the Galapagos spreading center and on the East Pacific Rise at 21° N. The project succeeded in defining of the morphology and structure of the spreading center or median rift valley along with locating the zone of crustal accretion in the median valley floor.
After revision: The demonstration the viability of sea floor observations by submersibles made possible the subsequent discoveries of hydrothermal vents at the Galapagos spreading center and on the East Pacific Rise at 21° N. The project succeeded in defining of the morphology and structure of the spreading center or median rift valley along with locating the zone of crustal accretion in the median valley floor.