The warp core item elevator under Iron Island has its first rings, but its bottom is going where the iron golem kill chamber sits now. So this stream is about moving things out of the way. Basket plays alone.
A quartz run
The elevator's redstone needs observers and comparators, and Basket is out of quartz. That means the Nether. On the way Basket finds a path of end stone bricks that leads to the stronghold with the End portal, and wonders whether ghasts can blow it up. The stronghold gets torches too. "Maybe I've been playing too many CTMs," Basket says, but nobody wants creepers showing up.
Inside is a stronghold library. Basket checks a chest and makes a note: "So I can get books from here, that's cool."
Back home, the quartz goes into a batch of observers.
Lights in the bedrock
Down at the bottom of the dig, the plan is to clear the whole area to bedrock. A viewer asks why anyone would light bedrock. Basket's idea is sea lanterns set into the gaps, so the bedrock texture still shows instead of turning into a dark floor. The first test puts them three blocks down. A viewer asks to see four down, and after climbing a ladder for a look from above, Basket likes four better. It's "more subtle," with a few darker spots, but the bedrock still shows through. Redstone blocks would be another light, but without a witch farm they'd cost a lot.
A skeleton turns up down there, and Basket goes looking for whatever block it spawned on. Basket doesn't want anything spawning down there.
Two new kill chambers
Now the real job. The iron golems need two separate kill chambers, out of the elevator's path. Basket is low on hoppers, so it's back up to make more, then the walkway gets blocked so golems pile up while the work is done. The lava from the old chamber gets scooped up, and there's more lava nearby.
Each new chamber has a 3x3 of hoppers feeding into one block, clear glass walls, and signs holding the lava up. The first try puts the lava too high, where it would run into the water, so the signs come down a level. Lower lava also means fewer drops burn up. Then it's bucket after bucket until the lava is still.
Basket opens the walkway and the backlog floods in, too many at once. Basket counts seven in one spot and four in another, without knowing the normal drop rate. A viewer says the wiki puts golems at three to five iron each. "My guess is it's fine." The second side gets the same build, lava placed counter-clockwise around the middle. "Okay, so now the iron golem farm is functional again." The drops wait in hoppers until the elevator can carry them up.
Slimes from above
Basket has been hearing slimes. The guess is they spawn in a slime chunk up top and fall down, which would explain why slimes have sometimes turned up inside the kill chambers. One lands at the bottom and Basket kills it. The plan is to find the slime chunks and build a proper farm there. Meanwhile the mob farm is working.
Clearing the way
The last stretch is cleanup: chests broken and moved, space dug out, torches placed. The elevator will come down to the fourth level, and the other mob farms will feed into it. Basket ends with a tour for anyone new: the item elevator design, the older column next to it that's coming down, the iron golem farms in the corners, and slime farms still to find.
The video ends on the credits, with no gameplay after them.