Modern bathymetry relies on two primary methods to "see" through the water: BATHYMETRY Definition & Meaning - Dictionary.com
A is a specialized instrument used to measure the depth of water in oceans, seas, or lakes. While simple depth measurements have been recorded for over 3,000 years, modern bathymeters use advanced technology like acoustics and lasers to map the hidden landscapes of our underwater world. How They Work bathymeter