The Deep Dark is an underground biome that was officially added in Minecraft's 1.19 The Wild Update. This biome generates below Y-Level 0 and is the only place where the Ancient City can spawn.

But the Deep Dark is more than just the Ancient City: it's a place where Sculk, Sculk blocks, and the fearsome Warden will spawn. I've been digging through Minecraft seeds and found some of the most interesting and best Deep Dark Seeds for the Bedrock and Java editions.

If you are looking for the Deep Dark, then these seeds are for you.

Seed: -3757046195784139679