How to build underwater! YES ITS POSSIBLE!

Overview

You can only build ontop of water but if you build on water with scaffoldings like in my screenshot you can displace ocean and build underwater, then fill it back in; thers a bit of a trick to it and im not going to get into to much detail but with a little quick thinking after viewing the screenshot you should be able to figure it out!

So if you haven’t figured it out yet….

Start at the shore at sea level and start placing scaffoldings on the water, then delete all the ones up to the edge of the water so that their is a little scaffolding wall holding the water out, then dig out the next level, place scaffoldings on the new lower water level, delete them to remove the water, dig repeat!