Add Yahoo as a preferred source to see more of our stories on Google. On October 6, 1970, the deep-sea drilling vessel Glomar Challenger returned to port in Lisbon, Portugal, bearing a cargo that ...

This March 19, 1975, file photo shows the Hughes Glomar Explorer, a 618-foot-long salvage ship built by the eccentric industrialist Howard Hughes, at the Long Beach harbor dock in Los Angeles, Calif.

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