During the first part of the Deep Sea Drilling Project (DSDP), from 1968 to 1975, scientific ocean drilling was led and fully funded by the United States. However, guest scientists from around the world were invited to join Glomar Challenger’s 12-person scientific crew, some in co-chief scientist roles. The great success of DSDP led some countries to approach the United States about the possibility of a more formal relationship, and so began the International Phase of Ocean Drilling (IPOD) within DSDP in 1975. The Soviet Union, Germany, Japan, France, and the United Kingdom became partners, and scientists from those and other countries continued to sail on Glomar Challenger.
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