What technology is commonly used for underwater surveying in mine operations?

The commonly used technology for underwater surveying in mine operations is multibeam sonar. This technology is particularly effective because it allows for the mapping of the underwater environment with high resolution and efficiency. Multibeam sonar emits multiple sound waves simultaneously at different angles, creating a detailed 3D map of the seabed or underwater terrain.

While side-scan sonar can also be used for underwater surveys, its primary function is to produce images of the seafloor and identify objects on it, rather than generating detailed topographical maps of underwater mine sites. Radar is not suitable for underwater applications as it relies on radio waves that do not propagate well through water. Thermal imaging is designed for detecting surface temperature variations and is not applicable for underwater surveying as it does not penetrate water effectively.

In summary, multibeam sonar stands out as the most efficient and detailed method for underwater surveying in mining operations, making it the correct choice.