A level full of skeleton towers, wither skeletons, witches and evokers, cleared one spawner at a time by digging up through the middle. Then a magic mob with flames for legs shows up.
A cave of red tentacles, squids and a sunken boat, a room full of charged creepers, The Soul Slasher, and an emerald that was underwater the whole time.
A shulker box with a Totem of Undying turns up under the floor, then they walk into the Kraken Storm: a half-sunk ship full of spawners and a mouth full of teeth.
They find a third intersection, dig through walls of diamond ore to the emerald, open a chest packed with diamonds, and put Emerald 21 in the monument.
Scoti goes down to the purple ledges, a ghast fireball takes everything they were carrying, and then the two of them clear the cavern spawner by spawner.
Ghasts, blazes and creepers everywhere, a chest of building blocks blown away, and a tunnel built under fire. At the end of it is a Fortune IV pick called The Mountain Smasher.
A cavern full of lapis, iron, gold and diamonds, and spawners for all of it. Basket gets blown up at a quad spawner, and the wool and emerald stay hidden.
Back to the diamond room, which explodes as soon as the mining starts. Then a nether-brick hall with charged creepers, a Hexer and a skeleton that hands out bad potion effects.
Back in the nether-style level, they circle the walls looking for the way onward. They find caged spawners, a pit nobody wants, and a chest full of potions instead.
Still in the fiery level, one of them drops into a pit and finds the emerald, then it's a long retreat on fading fire resistance and a trip home to put Emeralds 19 and 20 in the monument.
A nether level full of blazes, ghasts, pigmen and magma cubes. Scoti turns up with the wool early, then a magma cube kills Basket and the gear has to be won back.
Into the red glass area: blazes, magma cubes and pigmen from hidden spawners. The one rule is don't hit the pigmen. Basket hits one with a record, and it goes downhill from there.
Inside the volcano: blazes, a ghast spawner, a lake of lava and one water bucket. Scoti dies twice, gear burns, the arrows run out, and an emerald turns up under a ledge.