This is an underwater city that took me about two weeks to build so diamond if you like it.
There is a farm, tree farm, animal farm, kitchen, 12 identical apartments, and more in this underwater city.

survival challenges:
fill all the chests in the kitchen with food
go tothe nether
go to the end
defeat the enderdragon

rules: 
no griefing
no trolling
no smoking 
no shananigans
no ediots

note: if you here a bunch of spiders, it might be because of the nearby spider spawner or caves that are below some areas