International Indian Ocean Expedition

The International Indian Ocean Expedition (IIOE) was a large-scale, cooperative scientific endeavor involving around thirty-six research vessels from numerous countries. It took place from 1960 to 1965. The expedition built upon earlier systematic investigations of the Indian Ocean, which began with the British Challenger expedition in the 1870s and continued with post-World War II voyages. The IIOE's research focused on understanding the ocean's marine geology, geophysics, and mineral resources, as well as studying the nature of monsoons. Subsequent research has continued to explore these areas, utilizing advancements like aerial and satellite photography.1