Minecraft 1.13 is now available on your game panel !

The tide is coming in at last! That's sea-faring speak for 'Java Players! Today you get the full Update Aquatic!'

There's a whole new ocean of features, impatiently waiting for you to dive in! Take a delightful swim with dolphins and tropical fish. Explore mysterious ruins and tragic shipwrecks while hunting for new deep-sea treasures. Meet turtles on the shore and defend their eggs from mobs with the new trident!

Trust us, you'll want that new weapon. Because our biggest ocean update ever has also made these seas much more dangerous places to explore. Get too distracted by the colourful coral, and you might get dragged down to the ocean floor by bubble columns. Which could result in introducing yourself to the Drowned. What are the Drowned? Why not swim down to the ocean floor and find out? After you!

Still, at least you're safe on land! Well, as long as you get enough sleep. Otherwise, you might meet The Phantom, the mob you voted into Minecraft last year. Be careful what you wish for, and enjoy the update!

THE UPDATE AQUATIC CHANGELOG

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

BLOCKS

• Added blue ice
  • Found in icebergs
• Added coral blocks
• Added coral fans
• Added coral
• Added conduit
  • Combine 1 heart of the sea together with 8 nautilus shells to create the conduit
  • Makes your life underwater a lot easier
• Added dried kelp block
  • Combine 9 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

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
• Removed Herobrine

ITEMS

• 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

BIOMES

• Added multiple ocean biomes
• Added coral reefs
• Added underwater caves
• Added underwater ravines

STRUCTURES

• Added shipwrecks
• Added underwater ruins
• Added icebergs

Source : https://minecraft.net/fr-fr/article/update-aquatic-out-java