Underground Jungle



The Underground Jungle is one of the most difficult areas in the world of Terraria(Pre-Hardmode). It is a dense network of small caverns, populated with thorns, water, and some of the more difficult enemies. You can safely but slowly make your way through if you have the Vilethorn, since you can wall yourself in at the first sign of Hornets and then kill them through the walls.

Shrines are common in this environment, often containing chests with rare items or weapons that can't be found anywhere else. Materials such as Stingers, Jungle Spores, and Vines (for use in crafting rare items) can also be gathered here in abundance. This biome will most likely end up taking you to The Underworld without much additional digging.

Hunting the Jungle
The Underground Jungle can be found directly under the Surface Jungle biome. Underground Jungle monsters and loot begin to appear in the middle of the Underground layer, at these depths:

Hardmode
It is suggested that you should gather all the materials you could want from the Underground Jungle before activating Hardmode; the uncontrollable spread of the Underground Corruption will most likely destroy all jungle areas, unless proper Hallow precautions are taken.

While underground mud by itself somewhat resistant to corruption spread, corruption still can spread through underground jungles by converting jungle grass right to corrupted grass. So, to save underground jungles from full conversion, you need to ensure that there is no jungle grass blocks in three square radius to any corrupted or corruptible blocks.

There is a lazy and cheap method to save underground jungles: you can wait some time while corruption will spread a bit on underground jungle and then destroy any corrupted grass in three square radius to remaining jungle grass. This will prevent any further spreading because corrupted grass cannot grow underground.

History
Jungle souterraine Underground Jungle Underground Jungle Подземные джунгли