The paper presents a brief review of twenty-five years of activity of the Deep Sea Drilling Project and the Ocean Drilling Program (DSDP/ODP). It is believed that scientific ocean drilling is the cradle of the modern geoscientific thought and global geology. About 182 km of deep-sea cores recovered from the drilling of every ocean have verified the theory of global plate tectonics, carrying within itself the newly-emerged branch of geosciences known as paleoceanography, and has provided great quantities of information concerning such fundamental geoscience problems as global change, high-resolution global stratigraphy, deep ocean sedimentology, global events, and the origin of hydrocarbon resources in the world's oceans. Prospects for the 21st century's ocean drilling program is discussed briefly as well.