Area Zero Underdepths

The Area Zero Underdepths (Japanese: ゼロの大空洞 Great Zero Hollow) is an area located within the Great Crater of Paldea at the center of the Paldea region, but even deeper than Area Zero. It was formed 2,000,000 years ago by seismic shifts and cave-ins.
==In the core series games==
===History===
====Background====
The Area Zero Underdepths was formed 2,000,000 years ago by the same seismic shifts that caused to go extinct. At some point, numerous cave-ins also took place in the underdepths, resulting from tectonic activity and erosion caused by rainwater or groundwater.
200 years ago, during the first Area Zero expedition, the historian Heath strayed from his team and somehow ended up in the underdepths, where he encountered . He coined Terapagos's name and even theorized that it could be the origin of the crystallization phenomenon. When he returned to the surface, he wrote about their encounter in the Scarlet Book/Violet Book.
========
=====The Indigo Disk=====
After gaining the permission from Paldea's Pokémon League to go into a new expedition to Area Zero, Briar invites the , Carmine, and Kieran to serve as her protectors. Using Geeta's Indigo Disk, the four gained access to the elevator of Zero Lab, allowing them to go down into Area Zero Underdepths to find .
==Geography==
The Area Zero Underdepths is a large cavern, roughly 3,300 feet (1 kilometer) below the surface, located beneath Area Zero. It is only accessible via the elevator in Professor Sada/Professor Turo's Zero Lab and only unlocked by using the Indigo Disk.
From the composition of the rock, the underdepths likely formed approximately 2,000,000 years ago, predating even the formation of the Great Crater of Paldea. It experienced numerous cave-ins in the past, likely due to erosion and tectonic activity, but has remained stable since the last major cave-in. There are also indications that many objects or creatures filled the space prior to the current cavern's formation.
The Area Zero Underdepths consist of several large chambers connected by tunnels. It is filled with large Terastal crystals, similar to those found at the bottom of Area Zero. These crystals increase with depth until the deepest tunnel is made from solid crystal. Also near the bottom of the Underdepths is a subterranean lake. On an island in this lake is a large tree, seemingly covered in or made from crystal. 
Several Pokémon species also inhabit the Underdepths, primarily Pokémon with an association with crystals. Prior to certain seismic shifts, supposedly lived there before becoming nearly extinct.
==Places of interest==
===Tera crystal clusters===
There are several clusters of Tera crystals blocking paths all over the Area Zero Underdepths. These crystals are theorized to be guardians "watching" over the hidden treasure of Area Zero. According to Briar, they're likely a manifestation of pure Terastal energy. She also also has no idea what might happen if they're destroyed with brute force. For that reason, the player has to defeat a Tera type Pokémon near it, which causes the cluster to be desintegrated, allowing the player, Briar, Carmine and Kieran to continue their expedition.
===Crystal tree ===
On an island in the center of a flooded cavern is a large, crystallized tree. This tree is similar to other trees up in Area Zero, however, it is completely crystallized and much bigger. The player has to go there and defeat a Stellar Tera type so that they, Briar, Carmine, and Kieran can progress further into the Underdepths. It may be based on the , a wish-granting tree that is said to be made of various types of gemstones.
===Secret cavern===
A secret cavern filled with different items that is blocked by one of the Tera crystals clusters until the optional Stellar Tera type is defeated.
===Terapagos's cavern===
This is the cavern where the Legendary Pokémon slumbers in the form of a crystal. appears to be the last one of its kind after seismic shifts brought the species to the brink of extinction. The cavern is located at the very bottom of the Underdepths. 
There, the player, Briar, Carmine, and Kieran find Terapagos. Kieran is the one to catch it, but after losing to the player one more time, Briar advises him to stallize it into its Stellar Form, which causes it to go out of control. However, the player and Kieran defeat it, allowing the player to catch it for good. 
==Items==
==Pokémon==
All Pokémon that appear in this zone are considered wanderer encounters internally (rather than spawning randomly), and therefore always appear in the same locations, have the standard 1/4096 chance to be , ignore any typical bonuses applied, and are additionally ineligible for naturally generated Marks (except for the Jumbo and Mini marks).https://twitter.com/Sibuna_Switch/status/1753874296772935729https://twitter.com/Sibuna_Switch/status/1601990353564966915
Species	Level
 	65
 	66
 	69
 	69
 	70
 	69
 	63
 	65
 	65
 	63
 	65
 	68
 	71
 	68
 	67
 	65
 	67
 	65
 	75
 	75
 	75
 	67
 	69
==Special encounters==
===Mandatory Stellar Tera Pokémon===
A variety of Tera Pokémon must be defeated in order to shrink the crystals blocking the way during the events of The Indigo Disk, allowing the player, Carmine, Kieran, and Briar to progress further into the Underdepths. None of them can be , and they are coded to never be .
===Optional Stellar Tera Pokémon ===
A can be encountered and subsequently defeated in order to shrink a crystal in the room prior to one that wraps downwards in a staircase. It cannot be caught, and is coded to never be .
===Terapagos ===
After Kieran has been defeated, he will attempt to Terastallize Terapagos, causing it to become uncontrollable. The player must battle it with no opportunity to change teams or heal from the end of the previous battle; losing this battle will revert the game back to before the player's battle against Kieran. It must be caught by the player upon its defeat, and is coded to never be . Additionally, this Terapagos is always coded to be male, despite it having a gender ratio of one male to one female.
In the battle against Stellar Form Terapagos, it has unlimited PP for all of its moves and four times the usual amount of health, with a large health bar across the top of the screen in a similar fashion to Titan Pokémon and Starmobiles, which identifies it as Terapagos, the Hidden Treasure of Area Zero. Its ability does not function. Similar to a Tera Raid Battle, it can put up a shield to become immune to many status moves and reduce the damage it takes from attacking moves. The player will be unable to Terastallize their Pokémon until they charge the Tera Orb by hitting with a certain number of damaging moves, but only two attacks are required to charge it, instead of the three from standard Tera Raid Battles. Unlike Tera Raid Battles, there is no time limit and no cheering, and the player can switch Pokémon and use items from the Bag.
Terapagos will put up three shields over the course of the battle: one at the beginning, and the others immediately after the previous shield is broken. Each shield covers 27% of Terapagos's health bar, and if any attack deals enough damage to break the shield, all further damage from that attack (including from multistrike moves) is prevented, similar to 's Max Raid Battles. When a new shield is put up, Terapagos is cured of any status condition, all stat modifiers to any Pokémon are erased (but other field effects such as weather and remain in place), and if any of the player's Pokémon have been Terastallized, they lose that status. The Tera Orb must be recharged before the player can Terastallize a Pokémon again.
*In the first phase of the battle, Terapagos is type, and Carmine participates as a partner using her Sinistcha. If Sinistcha faints, the player must continue the remainder of the phase alone. If Sinistcha has not yet fainted when the shield breaks, Terapagos uses on Sinistcha at that time, even if an effect such as would normally prevent the move from being used. This extra move ignores the usual accuracy and damage formulas and is configured to deal 9999 damage; then, if Sinistcha somehow has any HP remaining afterwards, its HP will be forcefully set to 0 anyway, ensuring that Sinistcha faints and does not participate in later phases.Sibuna_Switch on TwitterWhen the game says, in no uncertain terms, "no tea for you"
*In the second phase, Terapagos changes to a type, and the player must face it alone.
*In the third phase, Terapagos changes to a type, and Kieran joins as a partner using his remaining five Pokémon. Terapagos will remain Water type after the final shield is broken.
| style="margin:auto" |
|
|
|
| style="margin:auto" |
| style="margin:auto" |
== Trainers==
When Kieran is controlling Terapagos, it possesses twice the usual amount of HP and has a large HP bar at the top of the screen that identifies it as Terapagos, the Indigo Disk.
| style="margin:auto" |
==Music==
Games	Location 	Song name (Japanese) 	Song name (English) 	Composition 	Arrangement
 	When in the Underdepths 	ゼロの大空洞 	Area Zero Underdepths 	Toby Fox 	Hitomi Sato
 	During a wild Pokémon battle 	戦闘！エリアゼロのポケモン 	Battle! (Area Zero Pokémon) 	Toby Fox 	Go Ichinose
 	When Terapagos awakens from its gem 	蘇ったテラパゴス 	Terapagos Reawakened 	Toby FoxRei MurayamaGo Ichinose	Hiromitsu Maeba
 	When battling Kieran's Terapagos in the Underdepths 	戦闘！テラパゴス 	Battle! (Terapagos) 	Rei MurayamaGo Ichinose 	Go Ichinose
 	When Briar prompts Kieran to Terastallize Terapagos 	秘宝の条件 	What the Hidden Treasure Needs 	Toby Fox 	Hiromitsu Maeba
 	When Kieran attempts to recall Terapagos to its Poké Ball	テラパゴスの暴走 	Terapagos Goes Berserk 	Toby FoxRei MurayamaGo Ichinose	Hiromitsu Maeba
 	When battling Stellar Form Terapagos 	戦闘！ゼロの秘宝 テラパゴス 	Battle! (Terapagos, the Hidden Treasure of Area Zero)	Rei MurayamaToby FoxGo Ichinose	Go Ichinose
 	Upon Terapagos being captured 	テラパゴスを捕まえた！ 	Caught Terapagos! 	Toby Fox 	Hiromitsu Maeba
==In the TCG==
Area Zero Underdepths was introduced as a in the Pokémon Trading Card Game during the English Scarlet & Violet Series (the Japanese Scarlet & Violet Era). It was first released in the Japanese expansion and the English expansion, with artwork by MARINA Chikazawa. A gold-etched version with artwork by the same illustrator was released in the same sets. As long as this Stadium is in play, each player may have up to 8 Benched Pokémon (an increased amount from the normal limit of 5) if they have any in play. If a player no longer has any Tera Pokémon in play, they discard Benched Pokémon until they have 5 remaining. If this Stadium is removed from play, both players discard Benched Pokémon until they have 5 remaining, and the player who played the Stadium discards first.
==In other languages==
==References==
==Related articles ==
*The Hidden Treasure of Area Zero
* Professor Sada
*Professor Turo
*Area Zero
*Area Zero journals
*
*Paradox Pokémon
*Stellar (type)
Category:Scarlet and Violet locations
Category:Caves
de:Höhlensystem Null
es:Caverna Abisal Cero
fr:Abîme Zéro
it:Grande Abisso Zero
ja:ゼロの大空洞
zh:零之大空洞