It's time to do the monument stuff. One inventory is full, so the other gets to do all of them. Then it's on to a cave full of lava with gems in the ceiling, and a lot of things that want them dead.
Two wools left
Gray wool goes on. Emerald number 28 goes on. By their count, that leaves two more wools. They know where the white one is, more or less, and they hope the other might lead them to the last one. One of them is going in without a helmet because he broke it when he jumped in the lava. He's doing helmetless. The other takes a strength potion.
Not a girl's best friend
The next room already has torches in it, which is odd, because they've never been there. There's coal, a lot of endermen, creepers, and a lava sinkhole with a sign. It takes a while to read the sign without dying. It says those gems are probably not a girl's best friend. Diamonds.
Then a trap. Opening a chest makes some gravel fall, and the gravel was blocking charged creepers. They're careful and get through it, and spend a minute trying to work out how that chest even triggered it. Down below is a lot of lava. They should have brought fire resistance potions.
A miner's dream
Over the edge it opens into a huge cave of wooden walkways over a lava floor, with diamonds and emeralds in the ceiling. A miner's dream. The paths are missing pieces, and with Knockback and Punch on their gear they need to be careful not to hit each other off. A flame bow sets the wood on fire. Somewhere they pick up two purple and black blocks, the impossible block, a block that shouldn't exist.
There's a creeper spawner across the way, a blaze spawner up on an elevated platform, poison spiders, and ghasts from somewhere. A golden apple saves one of them. Then a creeper waiting at the bottom of some stairs does it, and the chat reads Scoti_Garbidis was blown up by Creeper. You just blew up my stuff, one of them says. Probably. There's knockback involved, and some debate about who told who to come up. Didn't want to be alone.
Bring a water bucket
Scoti heads back for gear. He's bringing diamond everything, including the only diamond pickaxe they have, a punch bow, Wither arrows, water breathing potions, and the one splash fire resistance potion they can find. While he's gone, the bottom wall gets lit up and the chest that triggered the trap gets stocked with coal and wood.
Then the plan. Some players water-bucket an entire lava floor before crossing it. You'd still die from fall damage, but at least you could get your stuff back. A water bucket comes out, the lava starts turning to obsidian, and it's actually really fast. The last word is a warning not to look at that lava hole without the other one.