When did Poseidon conduct the first recorded bathymetric measurement?

Poseidon is credited with conducting the first recorded bathymetric measurement around 85 B.C. during the time of the ancient Greek scholar and philosopher, Eratosthenes. This historic measurement involved determining the depth of the ocean, which was a significant advancement in the understanding of underwater topography. Eratosthenes, who was also the chief librarian of the Library of Alexandria, made various contributions to geography and astronomy, and his association with Poseidon in this context highlights the early efforts in the field of hydrography. Bathymetry, the study of underwater depth of ocean floors, has evolved significantly, but this early documentation marks a pivotal point in understanding the physical characteristics of the seafloor, which is essential for navigation, marine biology, and environmental studies.