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This article is about the major event/Intermezzo. For the music, see Under Tides (music).
EN Under Tides banner.png

Under Tides (SV; not to be confused with Children of Ursus) is the twelfth major event, third Intermezzo, and the first Celebration event in Arknights.

Release date
CN May 1, 2021 ~ May 15, 2021 (as Arknights CN's 2nd anniversary event)
Global October 21, 2021 ~ November 4, 2021 (as the 2021 Gift of the Deep Ones event)
TW January 26, 2022 ~ February 9, 2022

Operations

Clear 1-10 to access the SV (Under Tides) operations.

Deserted Salviento
Choppy Ruin

Choppy Ruin operations are available in the event's second week.

All SV (Under Tides) operations are worth 28 Originite Prime icon.png.

Annihilation

Flooded Seashore is introduced as the new Rotating Mission in November 1, 2021.

From November 1, 2021 to November 29, 2021, all Hypothetical Targets (The Grand Knight Territory Outskirts, Frozen Abandoned City, and Abandoned Mine) are available.

Operators

The following Operators will gain 50% more Trust (except from Annihilation):

Headhunting

The third Celebration limited headhunting banner, Deep Drown Lament, is featured.

  • A single Song of the Sea Headhunting Permit.png Song of the Sea Headhunting Permit can be claimed once while the Deep Drown Lament banner is up.
  • Every day, the player can perform one headhunting pull for free at the Deep Drown Lament banner. These free pulls do not transfer over to the next day, so they must be used before the daily reset.
Note: Skadi the Corrupting Heart will be added into the Celebration limited Operators' pool on Stultifera Navis (late October 2022).

Corrupted Iberian Record

All Deserted Salviento operations award Corrupted Iberian Record.png Corrupted Iberian Record when cleared, with more being given when the player clears the operation for the first time. Choppy Ruin operations only awards Corrupted Iberian Records when cleared for the first time.

Corrupted Iberian Records can be exchanged for various items in Barter.

The best Deserted Salviento operations to farm Corrupted Iberian Records are SV-7, SV-8, and SV-9 due to their good Orirock Cluster.png Orirock Cluster, Crystalline Component.png Crystalline Component, and Integrated Device.png Integrated Device drop rates, respectively.

Try to Survive

The Try to Survive rewards can be claimed until November 11, 2021.

Mission Reward
Clear SV-1.
Corrupted Iberian Record.png
30
Clear SV-2.
Clear SV-3.
Corrupted Iberian Record.png
40
Clear SV-4.
Clear SV-5.
Corrupted Iberian Record.png
40
Gladiia icon.png
Clear SV-5 with 3 stars.
Corrupted Iberian Record.png
60
Clear SV-6.
Clear SV-6 with 3 stars.
Portable Folding Table.png
Clear SV-7.
Corrupted Iberian Record.png
60
Clear SV-7 with 3 stars.
Folding Screen.png
Clear SV-8.
Corrupted Iberian Record.png
80
Clear SV-8 with 3 stars.
Wooden-Framed Hanging Light.png
Clear SV-9.
Corrupted Iberian Record.png
80
Clear SV-9 with 3 stars.
Resort Wallpaper.png
Clear SV-EX-1.
Corrupted Iberian Record.png
30
Clear SV-EX-2.
Clear SV-EX-3.
Corrupted Iberian Record.png
40
Clear SV-EX-4.
Clear SV-EX-5.
Clear SV-EX-6.
Clear SV-EX-7.
Corrupted Iberian Record.png
80
Clear SV-EX-8.
Clear SV-EX-8's Challenge Mode.
Plaque - Sink.png
Clear SV operations except SV-TR-1 15 times.
Corrupted Iberian Record.png
40
Clear SV operations except SV-TR-1 45 times.
Corrupted Iberian Record.png
60
Clear SV operations except SV -TR-1 85 times.
Corrupted Iberian Record.png
80

Barter

To buy all items with limited stock from Barter, the player must spend 6340 Corrupted Iberian Record.png.

Try to Survive missions award 1080 Corrupted Iberian Record.png while the first clear rewards of SV operations award 960 Corrupted Iberian Record.png, thus requiring the player to farm 3900 Corrupted Iberian Record.png from SV operations.

Barter is open until November 11, 2021.

Item Price Stock
Gladiia's Token.png
1
250 Corrupted Iberian Record.png 1
300 Corrupted Iberian Record.png
350 Corrupted Iberian Record.png
400 Corrupted Iberian Record.png
450 Corrupted Iberian Record.png
Headhunting Permit.png
1
150 Corrupted Iberian Record.png 3
Bipolar Nanoflake.png
1
100 Corrupted Iberian Record.png 5
Keton Colloid.png
1
45 Corrupted Iberian Record.png 10
RMA70-24.png
1
40 Corrupted Iberian Record.png
White Horse Kohl.png
1
35 Corrupted Iberian Record.png
Upholstered Wooden Chair.png
70 Corrupted Iberian Record.png 1
Tourists' Personal Effects.png
65 Corrupted Iberian Record.png
Retro Lantern.png
40 Corrupted Iberian Record.png
Ocean Tide Chandelier.png
20 Corrupted Iberian Record.png 2
Grindstone.png
1
13 Corrupted Iberian Record.png 10
Coagulating Gel.png
1
12 Corrupted Iberian Record.png
LMD.png
5K
Corrupted Iberian Record.png 100
Strategic Battle Record.png
2
Corrupted Iberian Record.png 25
Tactical Battle Record.png
2
Corrupted Iberian Record.png 50
Frontline Battle Record.png
2
Corrupted Iberian Record.png 120
Skill Summary - 3.png
1
Corrupted Iberian Record.png 25
Skill Summary - 2.png
1
Corrupted Iberian Record.png 50
Polyketon.png
1
Corrupted Iberian Record.png 25
Sugar.png
1
Corrupted Iberian Record.png
Oriron.png
1
Specialist Chip
1
Corrupted Iberian Record.png 5
Furniture Part.png
10
Corrupted Iberian Record.png 200
LMD.png
20
Corrupted Iberian Record.png

Login Event

During the event, login to the game for 10 days to claim the following rewards.

Day 1
LMD.png
30K
Supporter Chip
2
Day 2
LMD.png
30K
Top Emergency Sanity Potion.png
2
Day 3
Orundum.png
200
Pure Gold.png
25
Day 4
Originite Prime.png
1
Strategic Battle Record.png
10
Day 5
Skill Summary - 2.png
15
Top Emergency Sanity Potion.png
2
Day 6
Originite Prime.png
1
Recruitment Permit.png
5
Day 7
LMD.png
30K
Orundum.png
200
Day 8
Chip Catalyst.png
1
Top Emergency Sanity Potion.png
2
Day 9
Originite Prime.png
1
Strategic Battle Record.png
15
Day 10
Professional
Expedited Plan.png
5

Store

ID Info Update Card Packs added into the Packs Store.

The following packs are available in the Packs Store until November 18, 2021:

Item Content Price
Rhodes Island Headhunting Pack
Top Operator Transfer Permit
Ten-roll Headhunting Permit.png
1
$29.99
Rhodes Island Resource Pack
Originite Prime.png
90
Ten-roll Headhunting Permit.png
1
LMD.png
200K
Chip Catalyst.png
4
Strategic Battle Record.png
30
Tactical Battle Record.png
50
Skill Summary - 3.png
20
Skill Summary - 2.png
50
$49.99
  • Note: Both packs can only be purchased once per account.

Outfits

The following outfits are available in the Outfit Store:

New

In addition, players who had purchased Skadi's Waverider WR04 outfit before the event will receive one Outfit Voucher.png Outfit Voucher (given as an in-game mail) due to the release of Skadi the Corrupting Heart.

Furniture

The Iberian Resort Town furniture set is available; some of its parts are awarded from completing Try to Survive missions while others are available in Barter and Furniture Store.

Miscellaneous

Operator Record/Paradox Simulation

New Operator Records/Paradox Simulations are added for the following Operators:

Operator Operator Record(s) Paradox Simulation
Extra Work A Line for Three
Unexpected Annoyance Immovable as His Name
A Song and a Blue Feather Impregnable Illusion
  1. Painful Reversal
  2. No Less Than A "Pie"
Ha! Through to the Front!
Scorching-Hot Assault! None

Cautus Valley Mining Area

During the event, the player will receive one mining operation every day, which can be used to receive Orundum.png Orundum from three different types of Originium deposits in Cautus Valley Mining Area, selected at random in each use:

Deposit Value
Originium Crude Ore 300 Orundum icon.png
Originium Ore 400 Orundum icon.png ~ 1700 Orundum icon.png
Originium Vein 1800 Orundum icon.png
  • The amount of Orundum received will only be shown after the mining operation is completed.
  • If the mining operation does not reach an Originium Vein, the next mining operation(s) are more likely to reach it. If an Originium Vein was not reached by the end of the event, then the last mining operation is guaranteed to reach an Originium Vein.
  • Unused mining operations do not transfer over to the next day, so they must be used before the daily reset.
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