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A bathymetric survey is the scientific process of measuring and mapping the depths and shapes of underwater terrain. It is essentially the aquatic equivalent of a topographic survey, but instead of land elevations, it focuses on the seabed, riverbeds, lakes, and reservoirs. The term “bathymetry” comes from the Greek words bathys (deep) and metron (measure), highlighting its purpose of depth measurement. These surveys are crucial for understanding underwater landscapes, identifying hazards, and supporting safe navigation. Modern bathymetric surveys employ advanced technologies such as sonar, LiDAR, and satellite imagery to produce highly accurate maps. By providing detailed knowledge of underwater features, they serve as a foundation for maritime safety, engineering projects, environmental monitoring, and resource exploration. Without such surveys, navigation and construction in aquatic environments would be risky and prone to costly errors.