With the ice tray working, Basket has been busy between episodes. "I've been doing some work putting in the dome and digging some more out underneath," Basket says, and the episode opens with a look at it before heading off to dig for iron.
The dome from underwater
Basket pulls a helmet out of a chest ("a diving helmet," with Respiration and Aqua Affinity) and swims out to the dome. Underwater the ice layers are hard to make out, which Basket says is the idea. Back down inside, the space under the dome has a tree farm on grass, moved there because the drops are easier to collect indoors, and a few slimes that have to be cleared out.
The plan for the episode is iron. A beacon needs "164 blocks of iron or other sort of resource," Basket says, and the mineshafts around Basketopia are the place to look.
A spider spawner with loot
Out in an abandoned mineshaft, Basket follows the sound of spiders and digs into a dungeon full of them. "This is my first actual spawner," Basket says, the first one that is not a cave spider spawner. After clearing the spiders and torching the room, the two chests give up two records (C418 "13" and "cat"), gunpowder, a saddle, diamond horse armor and name tags. "We're no longer in the UHC mode," Basket notes along the way, and thinks the server may now be on hard difficulty.
Skeletons under a ravine
The next find is a skeleton spawner beside a ravine with a mineshaft running through it. Basket was not recording when it was found, so the clip starts with the room already lit. The chests hold another "13," iron horse armor, a saddle, iron and bones. A skeleton spawner is the one Basket wants: "I'll probably set this up as my experience grinder."
To find the spot again, Basket pillars straight up through the sand to the ocean surface, with a torch at the bottom so falling sand breaks instead of landing on Basket, and leaves a cobblestone column sticking out of the water. It turns out to be "not too far" from base.
A zombie spawner
The third is a zombie spawner, found by sound again, in a mineshaft room full of zombies. Its chest adds a saddle, a bucket and yet another "13." Other voices can be heard in this part, and a voice asks whether zombie grinders have any advantage over skeleton ones. Basket decides to stick with the skeleton spawner.
Almost a beacon
Back at base, a chest shows the haul: rows of iron blocks and some gold. Basket counts about 30 short and plans to use the gold blocks for now. The episode closes in the grassy room under the dome, among the chests and the lapis-block figures with heads on top. Basket says the next trip will be wither skull hunting with another player.