When a latent fingerprint is immersed in water, not only the water-soluble components of the fingerprint residue are dissolved, but also the fingerprint may be damaged by various environmental factors in the water. Depending on the location, the sea has tidal flats or other types of marine organisms. In addition, because the current speed and water temperature change, it has more complex and diverse environmental factors than other aquatic environments. However, studies to confirm the effect of the marine environment on the quality of fingerprints have not been conducted in the natural sea in Korea. In this study, authors tried to confirm the effect of marine environmental factors such as immersion location, water temperature, water depth, current speed, and typhoon on the quality of fingerprints. After leaving fingerprints on the specimen, it was immersed in the sea. Afterwards, the latent fingerprint was developed, and the quality of the fingerprint was evaluated and analyzed. As a result of the experiment, the immersion location and water depth did not affect the quality of the fingerprint. The quality of the prints decreased when the water temperature was high and the current rate was low. The fingerprints affected by the typhoon showed low quality. In addition, the fingerprints were damaged by contact with marine organisms, and the mud of the tidal flats attached to the fingerprint ridges, making the fingerprints visible.