An undersea home has certain pros and cons that set it apart from any other sort of base. An underwater home is immune to explosions, most mobs have difficulty attacking it, and it will provide a high level of protection and concealment. Additionally, the base can have access to conduit power. The difficulties with an undersea build in survival mode is that it presents challenges of reduced movement and mining speed, breathing while working, clearing water from the structures, and special measures for entry and exit on deep bases. Also be wary of drowned, as they are fairly common in oceans and sometimes have tridents, which can be very dangerous.
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1 Moving underwater 2 Breathing underwater 2.1 Java Edition 2.2 Bedrock Edition 3 Getting to the sea bottom 4 Building the base 5 Clearing out water 6 Drop-in construction 7 Hiding your base 8 Raiding an Ocean Monument 9 Videos 10 Tips
Moving underwater < edit>
Movement and mining speed underwater can be improved by the player equipping a helmet enchanted with the Aqua Affinity, which increases underwater mining speed, with a maximum tier of 1, and Depth Strider, which increases underwater movement speed, the maximum tier being 3.
Breathing underwater < edit>
Building underwater is safer and simpler while wearing a helmet enchanted with Respiration and having some 8 minute Potion of Water Breathings ready to drink. Note that Respiration only extends ones “breath holding” time, it does not give true underwater breathing. Although they do not give one enough time for work, even 3 minute potions will be of use in getting down to a deep base where you will have other means to keep breathing.
A dried sponge is an excellent way to remove a large volume of water from an enclosed volume. A conduit can also completely solve the problem of breathing. A sponge or conduit can be difficult or time-consuming to obtain in survival mode, however.
For extended work periods, a player will need to have air bubbles close by in which the breath meter can be refilled. The bubble column from a magma block will recharge your air supply but be careful that the downdraft does not suck you down into the magma block.
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Blocks that displace water source blocks
Examples of waterlogged blocks that don”t displace water source blocks.
Java Edition < edit>
Before the Aquatic Update (version 1.13) in Java Edition it was possible to make air bubbles with fence posts, signs, glass panes, iron fencing, ladders and stairs as these blocks did not fill their volume completely, and would drive out water when placed. With the aquatic update only doors, fence gates, and banners still have these properties, and only in Java Edition. In other versions all the rest will become waterlogged when placed into a water source block.
Doors and banners are the best options for making a breathing space as they can be placed on top of any block, even without walls on each side, and provide the needed head high air space. A gate needs to be placed against a head high vertical block, or be stacked up from the bottom to work. Note that only the upper half of a banner makes an air bubble so when placed on a wall it must be set head high.
Bedrock Edition < edit>
In Bedrock Edition, all blocks are subject to waterlogging, meaning there are no blocks you can use to displace water source blocks to create an air space. Doors, ladders, and gates can be used to displace running water only.
To make an air pocket in Bedrock Edition, place a solid block that can break quickly, like slime block or tnt. After breaking the block, quickly place a block that displaces flowing water, like a button, sign, or trapdoor, before a water source block forms in that space. The block where you place the sign is counted as a flowing water block, so a sign can create an air pocket there.
Getting to the sea bottom < edit>
In relatively shallow waters you can just swim down and place “bubble blocks” to create a place to stand. From that you can place blocks out into the water to make walls and then a ceiling, then use a method of clearing water to finish the room.
The “lily pad” method creates a 3×3 column to the bottom by dropping sand off the four edges of a lily pad from a boat on the surface. Alternatively you can place a block onto the lily pad to make it easier to place the sand. Once you have an enclosed 1 block column of water you work you fill the central block with more sand, then work your way down from the top digging out the central column of sand and replace at least one of the sides with a non-falling block, like dirt or wool, and place ladder blocks on the non-falling block. When you reach the bottom you can dig out through the solid wall (it will not collapse) and place a door to keep the water out. Or you can dig down further into the seabed and make your base entirely below water.
A relatively risk-free method of getting down to the sea bottom is to dig down from a nearby land mass and then dig out horizontally until you are at the desired coordinates, based in previously rowing a boat out to your planned base location to note the coordinates.
Building the base < edit>
If your base is big you must take out the water with a command block however if your base is small you can soak the water with a sponge to do it quickly. Once you have a safe place on the bottom you can start construction by placing a door just before a vertical wall then digging into the rock through the door. It is common for the sea bed to be gravel for 2-3 blocks so you should place a layer of solid blocks over top of the gravel to hold the water back as you remove the gravel. Once you have an entrance passage, you can place ladders, signs,(pre-Aquatic versions) or another door, banner, or gate (all versions) inside the first door, then remove remove it to make a flush entrance. You can even turn around to work backwards out into the water to continue your base that way.
For an inconspicuous entrance you can dig a 1×1 shaft down from your safe air bubble until you hit solid rock, then build further however you like. Avoid the risk of falling into a cave by standing on the border of two blocks as you dig first left then right on your way down.
To prevent flooding in the event of disaster dig down a block from floor level before digging horizontally. If your block(s) holding back the water are somehow broken, the inflowing water will drop into the hole and stop there.
Another measure to prevent flood damage is to use light sources that water cannot wash away, like jack o”lanterns, glowstone, or sea lanterns. Torches of course would be washed away if water ever flooded in.
Another useful measure to take is to construct an airlock at every door, and to make windows double thick.
Clearing out water < edit>
To make your base as a bubble under the sea you will need to clear water out of a fairly large volume.
The traditional method is to fill the space with a falling block (sand or gravel) and then dig it all back out. This method is well suited when you have constructed all of the walls and then cap them with solid blocks once the space is filled in. If you have slime blocks, honey blocks or TNT available in quantity they make a good filler as they can be insta-mined using just a fist and so can be broken even when you are fatigued by an elder guardian.
Alternatively, you can fill with a flammable block such as wood planks, wool, or leaf blocks. Fire does not burn evenly so there will probably be some manual clean up needed after the burn is done.
Using sponges is a great way to dry out a big volume of water. Sponges can be found inside ocean monuments. You can dry out ocean monuments using the methods above until you find some sponges; this is more time-consuming than swimming but eliminates the risk of drowning in case you get lost in the monument. When a sponge is placed, it will soak up water in a 9×9×9 volume centered on itself, and become a wet sponge. Bring enough wood and cobble down with you to make a crafting table and furnace to dry the sponges.
Larger spaces may be partitioned into smaller areas using fences, gates, doors, or whatever, and dried out a chunk at a time.
Making the walls and ceiling of a bubble base out of glass, fences, or iron bars makes for a spectacular view from both the inside and outside of the base. Under the right conditions a bubble base will be a beacon glowing beneath the sea to anyone who passes.
If you have a big, flat area to clear, it may be easier to build a device to clear the water for you (see Videos section).
Drop-in construction < edit>
This method is particularly good for building in very deep areas as it requires far less time working underwater.
Find a fairly deep patch of water with a relatively flat floor. Then build a platform on or above the water surface out of any non-gravity block that is easy to remove such as dirt, wool, or leaves. Using a cavity block, like gravel or sand, build the shape of your desired building on the platform like building a “sand castle”, but without the exterior walls. You won’t be able to have any overhanging exterior features and the interior must be a solid mass. When the “mould” is complete, remove the supporting platform blocks to let the gravity blocks sink to the bottom.
Now you go underwater to complete the build by constructing walls and ceiling around the moulded shape. Then you hollow it out and furnish it to taste.
A tip for hollowing out: Take advantage of how falling gravity blocks break when they fall onto a non-solid block like a slab or stair. With practice you can use it to dig out the block of sand at the bottom of a stack, and immediately place it to replace the gravity block. The rest of the column will collapse all the way from top to bottom.
Hiding your base < edit>
Camouflage is the best way to hide your ocean base. Make it as deep as possible in a deep ocean biome using blue glass for exterior walls, or make it look like a gravel “hill”. Prevent any light from inside getting out into the water by placing half slabs over any openings. If possible, keep your buildings small, separated, and in irregular shapes that mimic normal underwater terrain. Blue glass is the best transparent material for windows as it blends in best with water.
An interesting possibility is to hide in plain sight. Take over an Ocean Monument by drying out its interior and building a safe entry way from outside the protection zone of the Guardians. One could also use a submerged wreck as the entrance to ones base.
A good test of your efforts to conceal your base is to drink a potion of Night Vision while floating on the surface over it. Take note of anything that gives the bases existence away. Screenshots with F2 are good for this, and have another go at your camouflage.
Raiding an Ocean Monument < edit>
You can make an ocean monument your underwater base. After Raiding an ocean monument, you can make it your underwater base. First, see Tutorials/Defeating a monument for advice on how to defeat the monument. After you have removed the threats, separate each room by using blocks or doors. After that, use sponges to clear out the water in the room. Finally, repeat doing this to each room until you have a whole ocean monument with no water inside. If you need to, you can also clear the water outside, so no guardians spawn outside of the monument. You can build conduits to give conduit power to players. You may break the walls inside the monument too.