the October 16 hotfix opened part two of Yesterday's Sea and stacked three separate deadlines into one week. This guide splits the 1,200 sanity into three blocks, ranks the Labor Ration Office purchases, converts one 6★ elite promotion into sanity, gives a straight answer on Clemencia, and explains why feeding the base Recycling Station right now is a waste.
| Item | Verdict | Basis |
|---|---|---|
| Event stages | Close 03:59, Oct 23 | Official event preview, 2026-10-03 |
| Abyssal Cruise banner | Close 03:59, Oct 23 | Same notice |
| Labor Ration Office | Closes 03:59, Oct 30 | Same notice |
| Sanity available | About 1,200 | 5 days × 240/day (in-game rule) |
| Lugu | Event-only, in no banner | Official event preview |
| Greystone Theater | Map swap at 04:00, Oct 26 | Official notice, 2026-10-11 |
Arknights Yesterday's Sea deadlines: three clocks running in one week
The October 3 preview pins the schedule down: Yesterday's Sea runs to 03:59 on October 30 overall, but the stages are gated in two parts and both close at 03:59 on October 23, while the Labor Ration Office stays open to 03:59 on October 30 and takes Future Outlook Mirrors as its currency .
| Content | Opens | Closes |
|---|---|---|
| Stages, part one | Oct 09, 12:00 | Oct 23, 03:59 |
| Stages, part two | Oct 16, 16:00 | Oct 23, 03:59 |
| Abyssal Cruise banner | Oct 09, 12:00 | Oct 23, 03:59 |
| Labor Ration Office | Oct 09, 12:00 | Oct 30, 03:59 |
Entry needs main story 1-10 cleared, so a fresh account can reach the stages .
What the October 16 hotfix actually changed
The October 16 hotfix ran from 16:00 to 16:10 and shipped four things: part two of Yesterday's Sea, the Hengyuan Jinliang collaboration, a content expansion for the Integrated Strategies mode, and preloaded resources for the 04:00 October 22 standard banner rotation plus a refresh of the Advanced Certificate exchange .
Two lines in that notice matter more than they look. One fixes a bug where Clemencia's skill failed, in certain cases, to consume ammo and to damage ground enemies at the target tile and the four surrounding tiles. The other hands out 200 Orundum to anyone who registered before 16:00 that day. That first line is the giveaway: her skill settles on ammunition, not on a cooldown.
Why the event does not run to October 30
Here is the trap: it is not that the stages stay open until October 30 — rather, the stages close on October 23 at 03:59 and only the shop survives to October 30. Both timestamps sit in the same announcement, one under the stage section and one under the Labor Ration Office section .
Anyone who budgets twelve days and 2,880 sanity off the October 30 date will spend the last week staring at an empty plan. After the 23rd there are no stages left, so no new tokens drop at all, and a single miscalculated day throws away 240 sanity.
Do not burn Orundum before the October 24 stream
Production Communication #70 puts the 2026 Thank-You Celebration preview stream at 19:30 on October 24, covering the celebration events, a new SideStory, the next limited banner, and the roadmap beyond it. Banner order and the character list are not announced yet.
The communication reward is 200 Orundum plus 5 Polyester Group, delivered at 17:00 on October 17 with a seven-day mail expiry. That means the mail dies at 17:00 on October 24 — two and a half hours before the stream starts. Claim the mail first, then watch.
How to split 1,200 sanity across five days
Five full days at 240 sanity each is 1,200 sanity, and that budget covers exactly three jobs in a fixed order; get the order wrong and you are buying sanity with Originite Prime .
| Block | Dates | Sanity | Job |
|---|---|---|---|
| Patch the holes | Oct 18 to Oct 19 | 480 | First clears on YW-1 to YW-4, plus YW-TR-1 and the YW-ST branches |
| Clear the missions | Oct 20 to Oct 21 | 480 | Salvage Plan missions, which pay Lugu and module materials |
| Close out | Oct 22 to Oct 23 | 240 | Top up the token gap, start nothing new |
Where do you farm Future Outlook Mirrors fastest?
Future Outlook Mirrors come from exactly two places: combat in the event stages, and the Salvage Plan mission rewards . Stages carry no attempt cap, so the real cap is sanity — 240 a day from regeneration, 1,200 over five days, with potions counting as stock rather than daily income.
Fastest therefore means not wasting regeneration, not hunting the best drop table: log in twice a day, drain the 240, and ignore drop-rate theories. Per-run token counts and drop rates are not published; the stage results screen is the only authority.
The trade-off is simple enough to state plainly: mission rewards are guaranteed and drops are not, so in a five-day window you take the guaranteed part first and gamble the leftovers.
When to pop sanity potions
Save potions until October 22. Everything you hold is only useful while the event stages exist, and they vanish at 03:59 on October 23; the October 20 to 21 window belongs to Salvage Plan missions, which pay better per sanity than repeat farming. The 22nd is the day both constraints line up.
Labor Ration Office: what to buy first
Rank the Labor Ration Office by what disappears forever, not by unit price: one-time items such as the operator token, the skin, and the furniture go first, then permits and module materials, and only then the infinite LMD and battle records .
The official list runs: the Lugu token, part of the new event furniture set, recruitment permits, a limited skin, module materials, high-tier upgrade materials, LMD, and battle records. Unit prices and purchase caps are not in the announcement, so the in-game shop screen decides.
Is the Lugu token worth it?
Yes. Lugu is a 5★ Specialist available only through Yesterday's Sea and explicitly excluded from Abyssal Cruise and from every standard and kernel banner . Once the event ends, the token is the only route left to her potential upgrades.
Skip it and the collection slot stays empty forever, because there is no banner to pull her from later.
Skins and furniture: pick one
The limited skin costs tokens and nothing else, so take it if the balance allows. The furniture set is split: part comes from event rewards and exchange, part is sold in the furniture shop from October 9 to October 23, and a complete set needs both channels .
Leftover tokens are worth nothing. They expire at 03:59 on October 30, convert to nothing, and do not carry into the next event.
How many resources the final week actually costs
The final week costs four things: about 1,200 sanity, 180,000 LMD if you promote a 6★, the 400 Orundum already paid out in compensation, and 90,000 Orundum if you intend to hit the banner's 150-pull guarantee.
| Resource | Amount | Conversion | Source tier |
|---|---|---|---|
| Sanity during stages | About 1,200 | 5 days × 240 | Tier 1, in-game rule |
| LMD for one 6★ E2 | 180,000 | About 720 sanity, roughly 3 days | Tier 3, PRTS cost table |
| Guard Dualchips | 4, from the pack | Official Guard chip pack: 4 dualchips, 45 of book 3, 25 of book 2, 10 of book 1 | Tier 1, official notice |
| Orundum in hand | 400 | 200 hotfix + 200 communication | Tier 1, official notices |
| Banner guarantee | 150 pulls | 90,000 Orundum | Tier 1, official rate rule |
| Skin Gallery V | 6 entries | Per-entry cost not announced | Tier 1, official notice |
LMD math for one 6★ E2
CE-6 pays 7,500 LMD for 30 sanity, which works out to 250 LMD per sanity (in-game yield, consistent with PRTS data). A 6★ elite promotion needs 180,000 LMD, so it costs 720 sanity, or three full days of regeneration.
Put that against the five-day budget: 1,200 sanity dumped entirely into CE-6 yields 300,000 LMD, enough for 1.6 elite promotions. "Clear the event first, build later" is arithmetic rather than attitude — promoting one 6★ during the final week eats three of the five days whole.
How to estimate the days
Divide the total requirement by 240 per day instead of multiplying remaining days by 240. The first tells you whether you can afford something; the second only makes the calendar look generous. Here 1,200 ÷ 240 = 5 days, which is the entire stage window, and 180,000 LMD needs 720 sanity, or three of those days.
What not to stockpile
The Recycling Station's output categories and rates are described only as "upgrade materials" with no list and no numbers, and the per-item price of Future Outlook Mirrors is likewise absent from the announcement . Budget both off the in-game interface, and do not reuse last month's price sheet.
Is Clemencia worth building?
Build her if you pull her, but do not rush her to beat the October 23 deadline. Clemencia is a 6★ Guard whose skill settles on ammunition, so her damage window is set by ammo count and her value sits in mastery levels rather than in pushing her to level 90 .
Which account should build her first
| Account state | Build first | Why |
|---|---|---|
| No reliable lane holder | Clemencia | 6★ stat line carries main story and event pressure maps after E2 |
| Already has a built Guard core | Lugu | Free 5★ Specialist, fills the collection and trust, costs no pull budget |
| Wants a cheap support body | De Toledo | 5★ Supporter, joins the standard pool at 04:00 on October 22, so you can land her off-rate later |
Clemencia and De Toledo both join the permanent standard pool at 04:00 on October 22, with Guard and Supporter classes per PRTS data . That single line decides the whole argument: she is not limited, and the character survives the banner.
Should you pull? Reading the 150-pull guarantee
The 150-pull rule is a worst-case ceiling, not a promise that saving up secures the unit. Official wording: if 150 consecutive pulls fail to produce the rate-up 6★, the next 6★ obtained is guaranteed to be that rate-up operator . Clemencia takes 50% of the 6★ rate; De Toledo and the second 5★ split 50% of the 5★ rate.
At 600 Orundum per pull, 150 pulls is 90,000 Orundum. Without that balance, admit you are playing a probability game. With it, remember that the October 24 stream may reveal the next limited banner, and pity does not carry between different limited pools.
Base Recycling Station and Activity Room: touch them now or later?
Leave the base alone this week. The Recycling Station and Activity Room arrived with the October 9, 12:00 update, and rebuilding costs room slots plus drones while every drop of sanity is going into event stages .
The level-3 threshold
The Recycling Station is not a machine that only pays out when you feed it — it converts materials automatically and produces upgrade materials over time without consuming any input at all. Only at level 3 does it unlock Conversion Efficiency Up, which lets you dump surplus materials in to speed the process further .
Feeding it before level 3 is pure waste. Wait until the stages close on October 23, then push to level 3 in one go and pour the overflow in.
The Activity Room is not a dorm
A dorm manages mood and decides whether a shift rotation can run back to back; the Activity Room handles operator-side progression. The official screenshot of dorm B401 shows atmosphere 5000 and mood recovery 2 per hour, numbers that depend on dorm level and furniture alone and have nothing to do with the Activity Room .
Confusing the two facilities usually ends with a dorm stuffed full of furniture and an Activity Room sitting empty.
Three other October nodes: Hengyuan Jinliang, Greystone Theater, the celebration stream
Three dates in late October have nothing to do with Yesterday's Sea sanity: the Hengyuan Jinliang sign-in, the Greystone Theater Annihilation swap, and the October 24 celebration stream.
Sign in three days for Hengyuan Jinliang
The National Library collaboration Hengyuan Jinliang runs from 16:00 on October 16 to 03:59 on October 30, and three cumulative sign-in days pay event furniture, at zero sanity cost . The accompanying Book Collection pack sells until 03:59 on November 6 and contains 800 Orundum plus three avatars; three collaboration skins also run to the same November 6 cut-off.
Sign-in events are the easiest thing in the game to forget, because they never appear in the stage list. Set a reminder, finish the three days, and stop thinking about it.
Greystone Theater replaces the Annihilation map on October 26
Annihilation adds Greystone Theater at 04:00 on October 26, running to 03:59 on January 25, 2027, and requiring main story 2-8 cleared. The new map replaces the current Annihilation map, which is archived into assumed combat targets once it closes .
Until October 26, Annihilation still means the old map. If you want this week's Orundum, do not swap early on the night of the 25th.
What the October 24 stream is for
The stream covers celebration events, a new SideStory, the next limited banner, and the roadmap . Banner order, roster, and event length are unannounced, so any "internal schedule" circulating beforehand is community extrapolation and a poor basis for spending Orundum.
Arknights Yesterday's Sea FAQ
When exactly do the stages close?
A: 03:59 on October 23, leaving five days; the Labor Ration Office runs to 03:59 on October 30, and part two only opened at 16:00 on October 16 .
What happens to unused Future Outlook Mirrors?
A: They expire at 03:59 on October 30, convert to nothing, and do not carry over; the exchange window is 12 days, so clear the balance by October 29.
Do I have to pull for Clemencia?
A: No. She joins the standard pool at 04:00 on October 22, and 150 pulls at 600 Orundum each is 90,000 Orundum, roughly 500 Originite Prime at 180 Orundum per stone.
Should I feed the Recycling Station now?
A: Not before level 3. It produces without input and feeding only raises conversion efficiency, so upgrade after the stages close on October 23.
How do I get Lugu, and can I pull her?
A: You cannot pull her. Lugu comes only from Salvage Plan rewards and the Labor Ration Office token, and both close with the stages at 03:59 on October 23.
Action list
- Audit first clears on YW-1 through YW-4 today, including YW-TR-1 and the YW-ST branches.
- Finish every Salvage Plan mission by October 21; Lugu and the module materials live there.
- Pop sanity potions on October 22 and dump the 240 into the token gap, not on the 23rd.
- Claim the communication mail before 17:00 on October 24, then watch the 19:30 stream before pulling.
- Clear the Future Outlook Mirror balance by October 29, and run the new Greystone Theater map only after October 26.
Schedules shift with each announcement, and GameHub keeps this page updated; the post-celebration SideStory and limited banner will get their own breakdown.
Game Guides
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- Wuthering Waves 3.7 Echo Guide: 12 COST Splits, Three Tower Teams
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- Zenless Zone Zero 3.3 Phoenix Build Guide: Dual-Anomaly Teams, Drive Discs and Shiyu Rotations
Phoenix arrives in the first half of 3.3, and taking her from zero to Shiyu-ready costs up to 28,800 Polychrome, 3.105 million Dennies and 300 Senior Investigator Logs. Her job is anomaly application plus team-wide anomaly crits, not on-field main DPS. Pull if your account has no Fire anomaly slot. Skip if your Fire anomaly core already works, and wait for Severian on November 11 if what you actually need is front-loaded damage.
- Palworld 1.0.5 Tech Unlock Order: Aquatic Construction Kit, Jetragon and the Material Route
Pal Tamer, version 1.0.5 shipped only two fixes, but read alongside the 1.0.3 and 1.0.4 balance passes, the late-game tech order looks nothing like it did at the 1.0 launch. The Aquatic Construction Kit dropped from tech level 66 to 23 and its Ancient Technology Point cost fell from 4 to 1, while the Jetragon-related tech dropped from level 79 to 70. This guide orders the line as unlock, then speed up, then save materials.