Minecraft wiki entry for Exploring_an_ancient_city, associated text: 1 Why bother?
2 What you will need
3 What you might also need
4 Starting Out
4.1 Finding a City
4.2 What not to do
5 Exploring the City
5.1 Destroying sculk shriekers
5.1.1 Mechanics
5.1.2 How many shriekers?
5.1.3 More than one shrieker
5.1.4 Strategies
5.2 The warden is here! (Evading the warden)
5.3 Brute-forcing it (with patience)
5.4 Getting into Redstone lab