A self-propelled submarine vessel with a spherical cabin designed to carry observers into the deepest ocean trenches safely.
From Greek 'bathos' (depth) + 'skaphos' (boat, vessel). Patented by Auguste Piccard in 1948 for extreme deep-sea exploration.
The Trieste bathyscaph descended to the Mariana Trench's deepest point (35,876 feet) in 1960—a record not broken for 52 years until James Cameron went down!
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