Go to the Deep Dark biome
Dig below Y level -51
Look for large open caves deep underground
Search for sculk blocks and sculk shriekers
Explore areas beneath mountain biomes
Use the /locate structure ancient_city command if cheats are enabled
Bring wool to silence sculk sensors
Move carefully to avoid summoning the Warden
Use night vision and torches for visibility
Check seed maps or online biome locators if needed