Download the .zip file. Do not unzip it. Minecraft reads compressed zip files directly. Note: Only download from reputable Minecraft community forums to avoid viruses.
Standard texture packs render stone, dirt, gravel, and deepslate as solid, opaque objects. The EagleCraft pack changes these textures to become partially or fully transparent. Consequently, when you look underground, the stone “vanishes,” leaving only the essential blocks visible—namely diamond ore, ancient debris, iron ore, gold ore, and cave systems. eaglecraft x-ray texture pack
Most modern Minecraft servers (1.16+) use "Engine Mode 2" or "Engine Mode 3" anti-X-Ray. These plugins send fake ore patches to the client. You might see diamonds with your EagleCraft pack, but when you mine there, you get stone. Download the