minecraft-source/src/net/minecraft/world/level/levelgen/NetherGeneratorSettings.java

package net.minecraft.world.level.levelgen;

public class NetherGeneratorSettings extends ChunkGeneratorSettings {
    @Override
    public int getBedrockFloorPosition() {
        return 0;
    }
    
    @Override
    public int getBedrockRoofPosition() {
        return 127;
    }
}