Ice biome



The Underground Snow is a biome, and is the underground version of the Snow biome, beginning at the Cavern layer and stopping at the lava layer. On the the Underground Snow biome ends before the cavern layer and beginning at the underground instead of ones on  and  of Terraria. It is composed mainly of Snow Blocks and Ice Blocks. Thin Ice can be found generated over water and breaks when a character falls over 4 tiles onto it (unless using the Ice Skates or another accessory crafted from them). The Underground Snow biome is the only place where Ice Chests can be found.

During Hardmode, the Corruption, Crimson, and Hallow can spread through it, generating Purple, Red, and Pink Ice Block respectively. They are unable to spread through snow blocks.

Armored Vikings, Snow Flinx, Icy Mermen, Ice Tortoises and Ice Mimics can spawn in this biome, and on the s will spawn much more rarely than the ones found on the s and s.

History
Toundra Souterraine