They start back at the sign for the Brown Crystal and Helician Labs, with the counter at Scoti 74, Basket 73. At first they think the level might be finished. It isn't. "There's still like a nuclear reactor and all this other stuff we haven't done." So the plan is simple: "We're going down!"
Bars over lava
On the way down, ladders go on the wall so both of them can get back out. At the bottom there are buttons to push, a "mad scientist with a bottle," and those mobs dropping experience bottles again. "It's not as bad as I thought." Then there are bars you can fall through, with lava underneath.
"Scoti_Garbidis tried to swim in lava." That's 75. "The real tragedy is that I lost all those ladders." One of them finds a water bucket, and the new plan is to put out every bit of lava they can reach. They also warn each other that the banners in the middle might be hiding more holes down to the lava.
Laser vision and invisible blazes
This is the nuclear reactor, and it's crowded. There are mobs with laser vision that hit anything in their line of sight, in different colors. There are blazes that seem to be invisible until they light up, and later it turns out they have thorns. Lightning keeps striking near the charged creepers in the middle. "Oh, good lord, I'm on fire. I'm very much on fire."
Then the chat: "Scoti_Garbidis was slain by Firestarter (Bottom)." The counter goes to Scoti 76.
"I'm gonna gear up and I'm gonna meet back up with Basket." Coming back in, one of them only has gold armor and a bow that "stinks."
Water everywhere
The rest of the room gets taken apart slowly. Water goes down around the edges, spawners come out one pillar at a time, and the mobs keep walking over the grates and falling in. "That's cool that these guys don't know how to... they get confused about this stuff and they fall in." One of them gives up on fighting for a while: "I'll be your torchbearer."
They find an emerald, and it gets carried to safety in a panic, all the way back up the elevator shaft to find a chest. Later: "You know, I should have just taken that chest that the emerald was in." There are also diamond blocks in the middle of the room, but nobody has a fortune pick on them, so those wait for later.
The glass case
At the far end is a glass case on a tower, with spawners around it and a harming potion spawner on top of the chest. "There's probably a Shadow Key." More blazes and dispenser-headed mobs pile in. "This is some slow going here."
One of them gets in, says "Nope, it's key," and runs. "I grabbed two of them." The other one isn't impressed: "You should never grab two. Just grab one and then run back." "I grabbed two, one for you, one for me, and I left one behind."
That's where it stops. The counter ends at Scoti 76, Basket 73. The monument isn't shown, so the emerald blocks stay at 8 of 12.