This one is a stream archive, about 80 minutes of Basket and Scoti_Garbidis heading underground with no particular plan except "do you want to go mining?" The in-game chat shows Scoti_Garbidis, Nemsun and TOLoneWolf2 joining. Before setting off, Basket pulls "Basket's Silk Pickaxe" out of an ender chest: Efficiency V, Unbreaking III, Silk Touch and Mending. It gets a lot of use.
Back into the mineshaft
The first stop is the abandoned mineshaft under the valley. Much of it is already lit, so the job is finding the dark parts. Basket clears cobwebs, fights off creepers and skeletons with "Basket's Pillager" and the shield, and grabs iron along the way. A chest minecart turns up loot, including a name tag, which comes in handy later. When the rails come up, the answer is a shrug: "now that we have an iron farm it's not as big of a deal."
The tunnels lead up and out at night. Back in town, Basket drops off gear at the house, cooks more fish at the furnaces and sleeps the night away ("BasketMC: Slept until sunrise"). Then the two of them head north over land, looking for a cave.
Wolves in boats
North of town they pass a small village, "more of an outpost," before they find wolves. Nobody has bones, so the plan is to keep the wolves from wandering off. Boats work. Each wolf sits trapped in a boat on the river while Basket goes to an anvil and starts naming them with name tags: "Basket Dog," "Basket Dog2," and one with the nameplate "Scoti Dog." The hope is that named wolves won't despawn while the two of them look for bones.
A spawner in the dirt
Then Basket hears something noisy, digs down through the dirt and opens up a dungeon with a zombie spawner and two chests. The chests give up bones and a golden apple, and the bones solve the wolf problem.
Taming goes about as well as it can. A few wolves turn angry, and a stray punch between the two players ends with the chat line "Basket Dog was slain by Scoti Dog2." The rest get tamed, Basket brings out raw meat to breed them, and the dogs follow the players back to town.
The lava cave
With the dogs put away indoors, the two head north again and finally find a cave that goes down. Lower down are pools of lava, a wide floor of obsidian where water met it, and plenty of redstone, gold, lapis and coal. Basket uses the silk touch pick on ore to bring it home as blocks. Creepers keep showing up, and one ravine turns out to bottom out at "height 29," not quite deep enough. The cave eventually loops back into another abandoned mineshaft.
Splitting the haul
To get out, they stair-step up to the surface and walk south until the town comes into view. At the house they empty everything into a double chest and split it. The diamonds and the redstone get traded off against each other, and Basket keeps the diamond ore blocks to break later with a fortune pick for extra drops. The video ends in town, with the loot sorted.