Could there be something rising from the sea floor?
According to Azooptics the green laser is usually used for β There are two main types of LiDAR: bathymetric and topographic. Topographic LIDAR uses near-infrared lasers to map land features, while bathymetric LIDAR employs green lasers (532 nm wavelength) to measure seafloor and riverbed elevations in water.
The preference for green lasers in bathymetric LiDAR arises from several advantages over traditional red or near-infrared lasers. The key advantage of green lasers is their ability to penetrate water, enabling the measurement of the river, shallow water reservoir, and coastal seawater depths up to three Secchi depths.β
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