Underwater imaging uses sound-based technologies like multibeam echo sounders (MBES), side scan sonar (SSS), bathymetric LIDAR, and scanning profilers due to light's limited transmission through water. MBES can measure thousands of depths per second to map ocean floors from ships or vehicles. SSS uses sound pulses to illuminate large areas of seafloor but creates shadows. Bathymetric LIDAR uses lasers to map clear waters' surfaces and bottoms from aircraft. These technologies continue improving our understanding of the 70% of Earth covered by oceans.