Deepsea Metro

The Deepsea Metro is a subway system running deep beneath Inkopolis that serves as the mission hub for the Octo Expansion. It operated by the Kamabo Corporation, and its conductor is C.Q. Cumber. Iso Padre, Cap'n Cuttlefish, and the denizens of the deep are seen riding in subway cars as passengers, with specific denizens varying based on which line the car is on.

The Deepsea Metro runs along ten lines, denoted by letters A to J, each containing stations that make up the Expansion's levels. There are a total of 85 stations, including eighty mission stations, four thang stations, and Central Station. 22 of the mission stations are exchange stations, connecting two different lines of the Metro. When Agent 8 completes an exchange station's mission for the first time, the connecting line is revealed and C.Q. Cumber gives them CQ Points as a reward.

Quotes
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S2 Icon Cap'n Cuttlefish.png Cap'n Cuttlefishgreen
"I'm pooped, Agent 8. Gotta rest my cuttlebones here for a bit."
 * After arriving on board:
 * After arriving on board:

"You gotta be squiddin' me! A talkin' sea slug?!"

"That's right! We want out of here!"

"So all we gotta do is pass some tests and find some thangs and we can go home?"

"Huh... Is this thing working?!"
 * After clearing Fake Plastic Station:

"Oho! I hear something! Come in, Agent 3! Agent 3, do you copy?!"

"EXCUSE ME?"

"Hwa-?! Who am I speaking to? Where is Agent 3?! State your names!"

"Oho?! Check it, kid. Are you stepping to me with a rap battle?"

"MC Craig in the house!"

"Call me Cap'n Cuttlefish, but not because I cuddle with fish. Smooth like butta bet you wish that you could stunt a flow like this!"

"Mount Nantai... Why, that's near Octo Valley!"

"Agent 8 and I were near there, but orange seems to have taken us deep underground..."

"OK, well... Anyone who loves rapping is a friend of mine. Thanks for your help!"

"We're off to pass some sorta tests and make our way to the orange!"

"And by "we," I mean you, Agent 8! Time to get after it!"

"Not sure this Iso Padre is playing with a full deck... Doesn't seem like a bad chap, though."
 * After Iso Padre comes aboard:

"It's been a while, Agent 8! Glad to see you're still alive and kickin'!"
 * After defeating Commander Tartar:

"I got curious how things were down here... And you know, this place has grown on me!"

"Where's who? Oh, Agent 3 had business to finish up and headed out back on patrol!"

"If there's anything you've got left to do down here, I'll be glad to offer my support!"

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S2 Icon C.Q. Cumber 2.png C.Q. Cumbergreen
"Thank you for using Deepsea Metro today."
 * Greeting the heros:
 * Greeting the heros:

"I am your humble conductor, orange."

"Pardon me? I take it this is your first time riding with us..."

"Here's the deal..."

"We're in a vast underground facility operated by the orange..."

"It's a series of test chambers connected by the orange subway system."

"I see that you're in possession of a CQ-80 device."

"I take it your aim is to reach the orange?"

"Understood."

"The orange is a paradise to which we denizens of the depths are forbidden entry."

"To reach it, you must pass a orange at each Deepsea Metro station."

"You must also find and collect the orange."

"When all orange have been gathered, the door to the orange shall open."

"I believe so... Let me show you to your first test. Press X to activate your orange."

"Number 10,008, nice to have you aboard."
 * After defeating Commander Tartar:

"We applaud all of your previous efforts. It seems you've safely achieved your goals."

"Unfortunately, Kamabo Co. is in disarray..."

"But thankfully, Deepsea Metro service has continued without interruption."

"All we do, we do for the satisfaction of our customers..."

"Please allow me to announce a new service that we have just begun to offer."

"This service orange."

"We have a nice selection of premium offerings that should prove quite useful."

"This service is available at orange. I encourage you to stop by."

"This brings my announcement to a close... Safe travels, my friend."

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S2 Icon Pearl 2.png Pearlgreen
"Mic check, one-two, who the heck are you?!"
 * Answering Cuttlefish:
 * Answering Cuttlefish:

"Uh, I think I asked you first, dude. Anyway, I'm orange, but you can call me orange!"

"My deets? I'm short and sweet! I spit that fire make posers perspire."

"Step to my game? I'll bring the pain. I'm never shook because I'm OFF THE HOOK!"

"I don't really get what's going on, but hang tight. We got you!"

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S2 Icon Marina 2.png Marinagreen
"Pearl! Didn't anyone teach you to respect your elders?!"
 * Answering Cuttlefish:
 * Answering Cuttlefish:

"OK, you two... That's ENOUGH!"

"Mr. Cuttlefish, was it? We found a radio here and heard your transmission."

"We're currently on Mount Nantai. Where are you calling from?"

"I see... So you and this...Agent 8 don't know where you are? Sorry to hear that..."

"But worry not! From now on, you'll have me, orange-aka orange, supporting you!"

"I'll get to work analyzing your surroundings, and hopefully I'll be of some help to you!"

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S2 Icon Iso Padre.png Iso Padregreen green
"Beg your pardon, young squire. Might I orange at those trinkets you've got there?"
 * After coming aboard:
 * After coming aboard:

"Forgive me if I caught you off guard. grey"

"They call me orange. That's not my name, mind you, but it's the only one I recall now."

"Down here, we call those thin slices of memory orange."

"I've spent an age or two in the depths, hungry for them. They're my only link left."

"grey"

"I pray that you'll be the one to cut through the gloom and light the way to my dreams."

"Share your mem cakes with me, and orange. Safe travels, young squire."

"Wait. Let me make sure I understand you right. You completed a whole series?"
 * After completing one Mem Cake set:

"That's special. That's something else. I always wanted to see a full set."

"Two full sets now? Young squire, you've outdone yourself."
 * After completing two Mem Cake sets:

"I'm not much of a teacher, but if I was, I'd give you an A for effort."

"Well now, have you finished up a third set? May wonders never cease."
 * After completing three Mem Cake sets:

"I see you know the way through this thick, old carapace right to my heart."

"A fourth set? Every one? Once you get your sights on something, you don't stop."
 * After completing four Mem Cake sets:

"And why should you, when your dreams are in sight? Eyes on the prize, young squire."

"Five sets already. Where does the time go? You've come so far, and we've only just met."
 * After completing five Mem Cake sets:

"I was saving this for a special occasion, and I believe now qualifies."

"Your collection grows, I see. Six complete sets is mighty fine, no bones about it."
 * After completing six Mem Cake sets:

"I like to see you apply yourself. Does a world of good for my own dream."

"Seven series. I never thought I'd live to see the day. Maybe I should dream bigger."
 * After completing seven Mem Cake sets:

"Don't ever give up on your dreams, young squire, or they might give up on you too."

"Eight series now. That must give you a little thrill, right? Eight's an important number."
 * After completing eight Mem Cake sets:

"I wish I had an eighth of your tenacity, young squire. Alas."

"You're only one series off from a complete collection of mem cakes."
 * After completing nine Mem Cake sets:

"Yesterday's so close I can almost taste it. Bring us back those last few slices."

"Well now. A full, unbroken set of mem cakes. You're living the dream."
 * After completing all Mem Cake sets:

"Suppose the flip side is I won't see much of you anymore. Shame, that."

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Trivia

 * With exchange stations having two numbers, one for each of the lines they connect to, the first number is always backwards alphabetically. For example, Girl Power Station is denoted (and not ) because J comes after D in the alphabet.
 * The mem cake for these stations is always from the series of the latter letter line as well.
 * The music played in the subway train has a few notes of the Calamari Inkantation played in the background.
 * More notes are added as Agent 8 gains access to more lines. After clearing the game, the complete track containing the main melody of the Calamari Inkantation is played.
 * According to a Famitsu interview, Sound Director Minegishi comments that the Calamari Inkantation can be constructed as Agent 8's auditory hallucination, an inner melody of their mind that intensifies as more of their memory returns.
 * A poster advertisement of a video game console, resembling a Nintendo Entertainment System, can be seen in the subway train.
 * Deepsea Metro can be construed as a homonym of the D.C. Metro.