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[Kaiser Reinhard]

I was wondering if I could build a huge glass dome on the ocean floor for my dorfs to live in, but I don't know if there's a way to drain the ocean.

[IHateOutside]

You can use an insane amount of pumps spanning all the z levels from the top to bottom. This can me made easier with magma. You pour it into the ocean and seperate a section of the ocean off from the edges of the map (where water respawns).

[Puzzlemaker]

Um.

Welllll yes you would have to drain a section...

Try using magma to cordon off a section.  Although, the only problem with that is the wall would stay...

Maybe a large amount of pumps?

[XSI]

There are several ways to drain the ocean, one is the use of pumps, but that gets harder with deeper oceans.(Anything more then 1z level will probably give some trouble)Pumps will take a lot of wood(For power), and a lot of materials in general to make the pumps and the places to put the pumps. You will also need to make the top ring very big if you want to get to the lower levels of ocean, because each ring of pumps has to be smaller then the one above it(Or the dwarves won't build pumps, since they would be underwater)

You can also use magma, as mentioned, but it is possible to remove the magma wall after you're done with it by making a cave-in drop it several z levels underground. Even though that leaves the obsidian in a trench, it's still better then having a wall in the water after you're done.

You can also drain the ocean into an aquifer, but this will cause your fps to drop to 1-2 almost instantly. (Make sure you have a way to stop the flow of the ocean into the aquifer(!) )

There is the possibility of igniting lignite(Or coal/graphite/charcoal, so long as it burns a good time) in a bin, and then dropping the bin into the ocean. This has the same effect on your fps as the aquifer method, but it will stop on it's own after a while when the fuel is burned up.

I'm currently making a glass dome fortress on the bottom of a 6z level ocean myself, and I've found it's fairly slow work, so I hope you're patient enough to wait for the ocean to dry, and have enough ways to give dwarves jobs while waiting for the place to be dry enough to build.

[redacted123]

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[AlienChickenPie]

Drop cats into ocean, give cats a ridiculous temperature and heat resistance.

[quintin522]

Ive done this with lakes, dont know if it works with oceans. Choose a site in a biome that will freeze part of the year. Have all the glass made and already there for construction. As soon as the freeze hits, build the outside as fast as you can. You can always do the inside later, just make sure its water tight. After the freeze is over, just turn temperature off in the init file

[Itnetlolor]

You can always build a ziggurat of pumps to a reservoir of sorts, or drain it out of the map with it. Just be sure to use upward drawbridges at the end of the map to make sure no water escapes; except out of the map.

[Sizik]

Dump a bunch of bins full of burning lignite into the ocean.

[Shad0wyone]

Drop cats into ocean, give cats a ridiculous temperature and heat resistance.

Make them [NOBREATHE] if you want them to not die before you can mod it in, also make sure they can't learn swimming, so they sink.

[Itnetlolor]

Drop cats into ocean, give cats a ridiculous temperature and heat resistance.

Make them [NOBREATHE] if you want them to not die before you can mod it in, also make sure they can't learn swimming, so they sink.

[Demonic Spoon]

Ive done this with lakes, dont know if it works with oceans. Choose a site in a biome that will freeze part of the year. Have all the glass made and already there for construction. As soon as the freeze hits, build the outside as fast as you can. You can always do the inside later, just make sure its water tight. After the freeze is over, just turn temperature off in the init file

Negative, Salt water doesn't freeze.

[Joseph Miles]

I did this once. Took half a year OUT of game to do it, but with a single pump at a time I managed to siphon the entire ocean into one huge water tower, and build Dwarflantis. Took ages, and, sadly, nobody died in the construction. Even the one time I had a leak and somebody got stuck in the tower.

It's doable with four Z levels of ocean, just takes forever.

[Lord Dakoth]

A much more fun (and dwarfy) version of the Lignite Bin method would be to designate a pit over the ocean, and drop a caged SOF in. 

[Itnetlolor]

A much more fun (and dwarfy) version of the Lignite Bin method would be to designate a pit over the ocean, and drop a caged SOF in. 

I think the the FPS would go negative from that.