Black color is a huge part of their engineering, totally central to their main job: stealth. Even with complex gear like sonar, the paint job is the first line of defense. Matte black makes the vessel vanish, perfectly blending into the enormous, light-gobbling depths. That’s how they sneak around undetected for intelligence and combat—it’s all about going dark.But there’s more than just paint! The black exterior is covered in thick, specialized rubber sheets known as anechoic tiles. These things are painstakingly glued to the hull.