Central Station

Central Station, or Deep Sea Central Station as it is commonly referred to as, is the primary hub and starting point of the Octo Expansion.

Gameplay
After completing the tutorial station, Agent 8 and Cap'n Cuttlefish will find themselves at the Central Station. No weapons are allowed in the area. On an initial play through the only things of note in this station is the actual metro, which can be boarded in order to access the other station, and Telephone, who will act the primary catalyst of the Octo Expansion. After completing any of the Thang stages, Agent 8 will return to the Central Station with the Thang. After collecting all four Thangs, interacting with the Telephone will trigger the escape sequence of stages.

Postgame
After completing the Octo Expansion, Agent 8 can return to Central Station and go to the remains of the blender in order remember and replay the final act of Octo Expansion or watch the credits which is known as "Remember the Fight" and "Remember the Light" respectively.

Additionally, after completing Octo Expansion, a vending machine will now be functioning, the vending machine will accept either exchanges of either 15000 CQP or Mem Medals. The vending machine will randomly give items, including Food and Drink tickets, Coins, and Ability Chunks in varying quantities.

Secret Boss: Inner Agent 3
Upon completing all the Test Chambers and collection all the Mem cakes, Agent 8's final memory can be unlocked. Locker number 8 on the station's platform will open, and interacting with it will trigger a battle with their "Inner Agent 3". This acts as a Secret Super Boss in Octo Expansion. Beating this boss will reward players with the gear piece.

Compared with the Spinal Phase battle, Agent 3 still uses the Hero Shot (though Agent 3's accuracy has been increased), uses s, and has a completely new set of Special Wepaons. The fight also has five stages compared to the first fight's four. In this battle, Agent 3 is much more aggressive, has significantly more health to splat, and will dodge more frequently. Additionally, the arena is much smaller and has no inkable walls. An aggressive approach is vital in maintaining turf control in the arena. Just like the original battle, Agent 3 will start off each grounded stage with a.

During this fight, the classic pallete from Splatoon is revisited, with Agent 8's ink color being Blue and Agent 3's being  Orange. A slightly modified version of the original Calamary Inkantation is the background music for the fight.

Trivia

 * In a screenshot released shortly after the announcement of the expansion, this station was shown on the Deepsea Metro map. At that time, the translation was not yet finalized, and the station's subtitle was "Promise land here we come!"