Submarine stealth coatings are special coatings designed to reduce or conceal the sonar and radar signals of submarines, enhancing their stealth capabilities. These coatings typically involve a range of materials and techniques to reduce the probability of a submarine being detected by enemy detection systems when underwater.

The main functions of submarine stealth coatings include:

1. Sound Absorption: These coatings are designed to absorb the sound waves propagating in water, reducing the submarine's sonar signature. This is often achieved by using special sound-absorbing materials within the coating.

2. Radar Reflection Reduction: Stealth coatings can also reduce the radar reflection of submarines underwater, making it difficult for enemy radar systems to detect them.

3. Optical Reflection Reduction: While optical detection underwater is not as critical as on the surface, some stealth coatings can also reduce the optical reflection of submarines underwater, reducing the likelihood of being detected by visible light.

4. Corrosion Resistance: Submarine stealth coatings typically also provide corrosion resistance to protect the submarine's hull from the corrosive effects of seawater.

These stealth coatings are critical technologies in military and naval industries to improve the concealment and survivability of submarines. They are often used in combination with other stealth technologies and design features to reduce the risk of submarines being detected underwater. It's worth noting that submarine stealth coatings continue to evolve to adapt to new detection systems and threats as technology advances.