Prismarine V4.0a is a release file of the Minecraft shader Prismarine Shader, made for Minecraft 1.17.1, 1.18.1, 1.14.4, 1.16.5, 1.15.2. It was published on January 16, 2022 and is 0.4 MB in size. For the full description, screenshots and every other version, visit the Prismarine Shader shader page.
How to install: Put the .zip into .minecraft/shaderpacks (do not extract it) and select it under Options → Video Settings → Shader Packs. Needs Iris or OptiFine.