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[PatrikLundell]

I've found the magma sea, and certain resources in it. I now want to plan for digging down into the sea to get at said resources (and explore beneath, eventually).
I understand you can obsidianize magma by dropping water on top of it from at least one free fall level above, so you can reasonbly easily create an obsidian floor or wall. The question comes for the next level of magma: Can you create a vertical obsidian wall, or do you have to create an inverted pyramid where each lower level is one tile narrower than the previous one, since you reasonably cannot drop water from above when the previous level's obsidian is in the way?
If you create an obsidian wall, channeling to the level below on the inside will expose the next level of magma. If you then get the dwarves out of the way and drop water on it it will turn into obsidian (well the obsidianizing will happen regardless, but any dwarves will probably be steam boiled if not removed), but I would guess the magma on the side of that channel remains unaffected? Will a second channeling, this time into obsidian, followed by a drop of water onto the channeled tile reobsidianize it due to the influx of magma from the side, and somehow also obsidianize the side (magma) wall(s) because the tile now was only partially filled with magma (provided you can get the water drop timing right)?

[Foxite]

You cannot dig under the magma sea.

Spoiler: SPOILERS (click to show/hide)

There is a way to get to an area under the magma sea, but you cannot dig directly to it. You can get there by digging a Adamantine that you will have to treasure when you find it. But be CAREFUL ----- Digging through it is why your fortress falls 99% of the time you dig through.

Be careful when mining a certain blue ore, though!

[PatrikLundell]

Ah, OK. I had the impression there were more stuff down there besides what the blue stuff can yield. So the magma sea seabed is always made of semi molten rock or blue stuff, then?
I AM careful with the blue stuff, but provided the wiki is correct, there is a safe method of getting a fair bit of it. So far it's worked out: 100% mineable stuff from the top 5 tiers, 8 unrecovered tiles from the sixth one due to the risks. Haven't dug deeper there yet, as I've got enough stuff to keep the processing of it occupied for a fair while.