Minecraft: Java Edition - 1.13 (Update Aquatic) – Minecraft Feedback

GENERAL

All undead mobs now sink
Changed underwater visibility
- Your vision will gradually increase the longer you're underwater
Overhauled world generation
Overhauled command parser
Added new world type "Buffet"
- Allows you to create worlds with a unique biome
- More features will come to the Buffet world type in later updates
Added a bunch of new sounds
Added three new pieces of music
Added underwater ambience sounds
Added a swimming animation
- Press your sprint key underwater to start swimming
Added data packs
- Allows you to edit recipes, tags, loot tables, functions, and advancements
Added new advancements
Some blocks can now be waterlogged
- Use a water bucket on a block to surround it with water
Added an "Optimize World" button (singleplayer -> edit world -> optimize world), which upgrades an entire world from older version to the latest version in one go

Added blue ice
- Found in icebergs
Added coral blocks
Added coral fans
Added coral
Added conduit
- Combine 1 heart of the sea together with 9 nautilus shells to create the conduit
- Makes your life underwater a lot easier
Added dried kelp block
- Combine 8 dried kelp to create a kelp block
Added kelp and seagrass
Normal pumpkins no longer have a face
Added carved pumpkin
- Use a shear on a pumpkin to carve it
Added sea pickles
Added bubble columns
- Use either magma blocks or soul sand to create a bubble column
Added wood block
- Combine 4 logs of any type to create a wood block
Added stripped wood
- Right click with an axe on either logs or wood to create stripped wood
Added prismarine stairs and slabs
Added variantes for all 6 types of woods for pressure plates, trapdoors and buttons
Added turtle eggs
- Be sure to protect them from hostile mobs

Added tropical fish
Added turtles
- A friendly mob that lays eggs on beaches
Added dolphins
- A neutral mob that will lead you to treasure if you feed it fish
- Make sure to not hit them unless you want an entire pod after you
Added the Drowned
- Hostile mob that can be found naturally in oceans and rivers
- Can spawn with tridents
- Zombies will convert into Drowned if they're underwater for too long
Added Phantoms
- Get a good nights sleep if you don't want these coming swooping at you
- Drops phantom membrane
Added cod, salmon, and pufferfish as mobs
Changed the horse model to be more consistent with other mobs

Added tridents
- The newest weapon in Minecraft
- Drops from the Drowned
- Works as both a melee and a ranged weapon
Added trident enchantments
Added the ability to catch fish with buckets
Added map markers
- Hold a map in your hand and right click on a banner to create a marker
Added heart of the sea
- Found in buried treasure
Added nautilus shells
- Drops from Drowned and can be found from fishing
Added phantom membrane
- Dropped by Phantoms and gives you the ability to repair elytra and used for Potion of Slow Falling
Added scutes
- Dropped by baby turtles when they grow up
Added Potion of the Turtle Master
- Gives you Slowness IV and Resistance III
Added Potion of Slow Falling
Added dried kelp
Added spawn eggs for all the new mobs