This datapack is the same that will be used during the third season of the strife.
This adds a few features such as, admin inventory switch, helmet to glass switching to help preserve textures, no aqua affinity, identify if a player is in water, identify if a player is holding a block that can create an air pocket, more drowning damage, setting scoreboards that keep track of coordinates of all players, depth message above hotbar when in water, messages for shallows, lush, and depths, mining fatigue gets worse as you get deeper, lava causes radioactive damage.
This datapack does require optifine to fully work.
Works with the corresponding resource pack.