Create a Minecraft Java 1.21 schema...

Create a Minecraft Java 1.21 schematic of an underground prison dungeon inspired by a vanilla stronghold. The structure must look mostly vanilla, ancient, slightly mysterious, and only slightly more advanced than a normal stronghold. It should NOT look like a modern sci-fi base. Size: about 90 blocks long, 70 blocks wide, 35 blocks tall. The dungeon should be mostly underground and naturally embedded into terrain, with only a ruined stone entrance visible on the surface. Add a small broken entrance built into a hill or cliff, with stairs leading down into the dungeon. Main style: - vanilla stronghold style - stone bricks, cracked stone bricks, mossy stone bricks, cobblestone, stone, andesite, deepslate bricks in small amounts - iron bars, chains, lanterns, candles, barrels, chests, books