Tutorials/Drowned farming

Drowned farming is a way to harvest experience orbs, tridents, and other loot carried by drowned zombie mobs. Other loot includes weapons and armor (normal and enchanted) in various states of repair ranging from highly damaged to nearly new.

Location
The simplest way to start a survival-mode drowned farm is to locate a dungeon room that contains a zombie mob spawner. Ideally the room should be reasonably close to the overworld surface but can be any depth that allows for digging 5 blocks or so underneath the floor. Sometimes a dungeon is found a short distance inside a cave entrance. Unlike a typical XP farm, however, which generally requires a long falling distance from the dungeon to bring the mobs to near death, no deep excavation is required for a drowned farm.

Preparation
To construct a survival-mode drowned farm, you will need:
 * A conveniently located dungeon with a zombie mob spawner
 * Several torches
 * 2 or 3 pickaxes
 * Water bucket
 * Signs
 * Glass blocks (optional, but helpful for viewing when a zombie becomes drowned)
 * Hoppers
 * 1 or 2 chests (the ones found in the dungeon)

For convenience, it is nice to have nearby (outside the dugeon room):
 * A source of water, such as 3-block long trench of water, for an unlimited supply to scoop with the bucket
 * One lava block in a hole in a safe corner somewhere, for easy disposal of unwanted items collected by the farm
 * A home base or temporary base with your bed, crafting table, anvil, or other helpful items a short walk away
 * Gates or doors as needed keep mobs out of your cave or tunnel while you work

Construction
The illustration on the right shows a side view of a basic survival-mode drowned farm, showing the dungeon above and the trap / collection room below.

Prepare the dungeon
Upon locating a dungeon and breaking into it:
 * 1) Quickly place a torch on the mob spawner block to prevent it from spawning further zombies.
 * 2) Kill any remaining zombies in the room.
 * 3) Close off any holes in the walls other than the entrance way you intend to use to get in and out of the rooom.
 * 4) Loot the chests and collect the chests; you will need them later.
 * 5) It is not necessary to dig out one layer of the floor around the mob spawner, but doing so provides additional volume in which the zombies can spawn.

Take note of the coordinate location of the center block along the wall with your opening. This floor block is in line with the mob spawner. In the last step you will flood the dungeon with water and dig a hole in this location for the mobs to fall through.

After preparation, exit through your opening. We will close it off in the last step.

Dig out the collection room
From your entrance hall to the dungeon, dig out some downward stairs and a room underneath the dungeon. The room should be three blocks high. The ceiling of this room may be the floor of the dungeon above, or be a block lower. The room doesn't need to match the dimensions of the dungeon; it needs to be only large enough to move around. Three blocks wide is sufficient, with one wall serving as a boundary for the water channel in the next step.

Prepare the trap
At the most basic level, the trap consists of a single water block that the zombie falls through from above, landing on a hopper so the zombie's head remains in the water and drowns it. A sign on the wall is used to hold up the bottom of the water block, and solid blocks enclose the water on all sides. Some of these enclosing blocks may be glass, to allow for better identification of drowned zombies versus non-drowned zombies.

With a 1-water-block trap, zombies will crowd into that 1-block space, making it difficult to target the drowned ones with your weapon. It is best to allow the zombies to spread out as they drown by extending the trap to multiple blocks. In practice, trap using a 3-block water channel, with 3 signs and 3 hoppers, works sufficiently well.


 * 1) Place blocks (preferably glass) on the ceiling to contain the water channel. One side of the channel can be the wall of the room. The channel should be directly below the floor block previously measured in the dungeon above. This is where the water will fall through into the channel.
 * 2) Place signs along the wall. The signs will hold up the bottom of the water blocks while providing air space for you and mobs to pass by the signs.
 * 3) Using a water bucket, place a block of water on each end of the channel. If your channel is 3 blocks long, you need only two water blocks; the center block will fill itself in.
 * 4) Only after filling the channel with water, place the hoppers under each sign, pointing toward at the end of the line. This is the last step in building the trap. Be outside the channel before you install the hoppers or you will end up drowning yourself.

Start the farm
Finally, go back into the dungeon above.
 * 1) Place two water blocks, one at each corner opposite your entrance opening. The water should completely fill the room, sweeping you toward the entrance.
 * 2) Stand on the threshold of your entrance and dig out the center block in the floor along the wall, causing the water to spill down into the channel in the collection room below.
 * 3) Break the torch on the mob spawner. The torch will eventually end up in the chest in the collection room.
 * 4) A zombie will spawn instantly upon breaking the torch. Quickly seal the opening of the dungeon. You can seal it with glass blocks as shown in the illustration, to give you a view to the inside of the dungeon.

Operation
Go down into your collection room. You will see zombies fall into the water-trap channel and start wandering back and forth. After 30 seconds, the zombie will start drowning, quivering visibly for 15 seconds seconds, and then change color. Its pants will turn from blue to brownish. Its eyes, visible through the glass blocks, will also change to a blue glow.

Select a drowned zombie, and whack at its legs with any weapon (even bare hands). Four hits with a stone sword will kill it. The mob will die, you will collect XP, and its possessions will drop into the hoppers and end up in the chest. Eventually you will collect tridents, nautilus shells, gold, enchanted armor, and of course rotten flesh and miscellaneous other items. Because weapons and armor each occupy an inventory slot, the chests will soon fill up, so it is useful to have a garbage disposal unit (a block of lava) somewhere in a safe place in the room in which to throw unwanted items.

Baby zombies will occasionally spawn, but they won't drown because they're too short. Simply kill these when they appear. The slabs under the glass blocks will prevent them from escaping, and also prevent them from attacking you.

Fancy variations
The version described above is fairly quick and simple to construct in survival mode. It isn't automatic, however. It requires your involvement to harvest items from the drowned. Much fancier, and even automated variations of drowned farms are possible, incorporating ideas such as bubble-column elevators to bring items to surface level, and devices to sort items.