Looking for any tips for building underwater. Is there an easy way or am I doomed to drown? What the best/fastest way to make a room underwater.
Fill it in and then dig it out was only way i could do it but it really depends if you are going down in the water with a build or building under. If building under mark your center location dig from land under to the mark then build out,I Personally use a sinking feeling item that lets you breathe longer under water. I deplotted my old underwater build just didnt care for it.
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In water, I’d go with Conkuur’s idea. Build a giant filled in shape, then hollow it out. In lava, it’s the same way but 1 layer at a time from top to bottom 
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Best way for me. I used over time healing brews while under water. It’ll keep you from drowning and dieing. They are cheap to buy and the good ones last 1 min each I believe with Max zeal and attribute. I would grab 60 of them brews. This will give you all the time you need underwater while drowning but not dieing.
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Easiest way I suspect will be when the farming update comes out soon to Simply drop lava into the water over and over again and keep carving it out assuming that it’s not ridiculous materialize and you can reuse it over and over
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Build the bottom floor first then the side walls and fill it in plot by plot by plot…
Also, Healing potion (over time, not instant) and the right set of skills means you can stay underwater much longer (thanks to Fire for the tip BTW!). Keep an eye out on that healing time tho, it’s pretty short as compared to other brews!
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I do it backwards… create 2 layers at top and then remove the lower layer. This creates an air spot as long as you have the sides left alone… Then work your way down a layer or two at a time.
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I like the builder guild buff (the middle one) so filling in from the top with stalk active I can just hold the R2 button (mouse button on PC?) and move slowly about filling it in very quickly from the bottom up, then go to town with a 3x3…
No matter what method tho, it can be tedious!
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In regards to the farming update, we have no idea when it will be released, so I wouldn’t wait for that.
For the actual building, what I did was:
Lay down two layers, starting at ocean level and under it.
------------ (water)
XXXXXX (1st layer)
XXXXXX (2nd layer)
Then, remove the insides of the layers. Leave the “wall” up. You should plan for this wall to be your final material. Continue to add layers as needed.
------------
X - - - - X
X - - - - X
Try to add to the outside walls first, so you can swim up to air. The fill it and dig out. Dirt is the easiest to work with.
If you are building from the ocean floor up, though, I would get a sinking item. Setup a small shelter for yourself, like a 4x4x4 room. You’ll go in there to get air. Then build from the ground up. Exterior first. Once you have the ceiling in place, you can start at the top layer, placing and removing dirt to drain the water.
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Thanks everyone. I’ll use some of these techniques later when I get on.
I just recently built underwater. I did what Conkuur said. I would fill up the area I want to clear out with sand and dig it out. I can show you some tricks or tip if you ever swing by and I’m there. I never drowned doing it and I’ve come close a couple of times, but if you’re careful and time it it’s not too bad. It just takes some time to get use to.
You can check out my home where I dug out a large portion under water. I’m still working on it though. Its on Raxxa. If you go through the Ultima portal through the east gateway and then into the Raxxa portal and I have a portal right outside the Ultima Portal. It is “P1”. It’s straight ahead to the left if you are walking out of the portal. I also have an area right next to the Raxxa portal that I dug out that I can give you. I don’t plan on doing anything with it. Just swing by and let me know if you want that area or help trying to do it. My names in game are: Caustigan, Bigjuice, Herbert and Nevus at the moment. I’ll be on either one of those. I’ll try to and set up a message box next to the portal.
I’m currently working on a project that started underwater, and now is reaching massive lava pools. Layer by layer it gets done. I really really miss how in some other block games gravel and sand will fall when placed or disturbed. It is sooo much easier to fill things in with that stuff.
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So this is what I’m building. It’s a creature/store. You have to swim down into its throat to get in. I decide to put a portal in the throat and just build the insides of the creature in a safer location.
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That looks crazy dope, nice job
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Nice work indeed. Here i was to offer you to get rid of that water but you solved the Problem 
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I still died building that. Lol. I had the inside part built but had to destroy it because I built in a future expansion of the mall. The portal worked really good though. I may just build the store elsewhere now or just destroy everything and move not sure yet.
Nice work, really cool!
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use a forged tool that makes ya breath longer and drop to bottom faster dont know the forge names but someone gave a founder totem to me that does that super handy aquatic building tool 
use sand our foliage as fast filler and removable
build floor first etc etc
visit sunken town off aquatopia 
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