Minecraft Dungeons:Bubble Column



Bubble Columns are new underwater structures that appeared in the Hidden Depths DLC that act as oxygen refill stations and respawns. They appeared in three official Twitter videos  along with a Drowned holding a Trident in the first, and a Sunken Skeleton and Tropical Slime in the second.

Usage
Bubble columns are used for players to revitalize oxygen to allow them to progress further in the underwater levels, granting them Water Breathing and instant oxygen. They also act as respawns for when the player dies.