Episode 7 of Season 1 is a stream that opens on Cycle 23 with nine duplicants and the gas pump switched off. This video is about water: a pump at the bottom of the base, a pipe running up the side, and a pit dug out to hold it all, the tank in the title. On the way a tenth duplicant joins, a group gets stranded in carbon dioxide, and Filtration research finishes. It ends on Cycle 26 with the tank dug but not finished.
Pump and pipe
The gas pump's card reads Building Disabled, but the commentary thinks the air vents are doing their job: "this is sort of hotter here but then by this vent it's actually cooler," and the crops "are a little happier now." Food is still decaying, so a storage box comes out to make room for a refrigerator.
Liquid Piping is done, and a Liquid Pump goes in at the bottom of the base, where the water sits. "I'm trying to make a lower spot where the water will collect, and then we have to run power to it." A Liquid Pipe runs from it all the way up the side of the base, kept clear of the air ducts, to be tapped later for showers.
A new scientist, and a trap
The DNA Blueprint screen offers Mi-Ma, a Level 8 Scientist, Nails, a Level 7 Body Builder, and Leira, a Level 7 Artist. "I guess we'll do scientist, that might help with researching." That makes ten. During the stream two duplicants get new names, and the newcomer is set up on the Jobs screen as a researcher.
Digging the low spot for the water opens into a part of the cave full of carbon dioxide. The game is paused: "These people are now stranded." The oxygen overlay shows the dig in red, with a pocket of breathable air close by. The digs toward it get priority 9, along with a floor the duplicants can stand on.
Gossmann ends up boxed in. On the Jobs screen, building is switched on for Gossmann in the hope of a ladder out, and the ladder goes up: "Oh yes! Okay, that's great." An alert reads Made a mess, which the commentary blames on a duplicant in "our water supply." Nobody dies, and ladders go in along the edges so it does not happen again.
Filtration and a geyser
On the research screen the commentary weighs a way to scrub carbon dioxide and a way to turn slime into algae, then settles on filters. "I want to try and filter out some of this stuff." Filtration is picked, with a Liquid Filter among its buildings.
Natural gas turns up in the base, and a new pocket holds a Steam Geyser, venting. "It seems dangerous but also cool."
Digging the tank
The pipe looks full, but "that's not water that's pumping through, that's the air." Meanwhile the digging goes on. A stepped pit is dug out under the pool, and its bottom is walled "to make sure the water stays in there." Plants in the way are harvested and uprooted.
Algae and stress
Filtration finishes. The Refinement menu now has a Water Purifier and a Bio Distiller, which turns slime into algae and gives off polluted water. A tank for polluted water would come first, unless it can go straight into the purifier: "I do have quite a bit of sand, actually."
Alerts read Bed beyond reach, so more beds go in. Stress is high too, and the Massage Table sits unused: "They don't seem to care." Interior Decor is next on the research screen.
Where it ends
On Cycle 26 more plants are uprooted to clear space for a floor. The tank down below will come "at some point," and the video ends there.