When was the first scientific expedition to the Mariana Trench completed?
Quick Answer
Early scientific exploration of the Mariana Trench expanded in the 20th century, with major milestones in 1960 and later research dives. The 1960 Trieste descent was the first crewed visit to the deepest point.
The Full Story
Scientific exploration of the Mariana Trench developed through the 20th century, culminating in the first crewed descent to Challenger Deep in 1960 by Jacques Piccard and Don Walsh. That expedition provided the first direct human observation of the ocean’s deepest point. Later unmanned missions and submersibles expanded knowledge of trench geology and biology. The trench remains one of the least explored major environments on Earth.
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