The Deep South

After being stranded on the bottom of the sea, Fry meets a mermaid. On the sea bed, the crew discovers the lost of Atlanta.

Act I: "Sweet Zombie Jesus! It's huge!"
Hermes has requisitioned a license for Nibbler, but there has been a mixup and he got a fishing license instead - a mandatory one, too. Thus the crew is forced to go fishing, and they all take the Planet Express Ship and travel to the exact center of the Atlantic Ocean, where the ship stays in hover mode and everyone is using different methods to attract and catch fish. Fry and Hermes stick with old-fashioned fishing rods, while Bender uses a laser-guided one. Leela aims higher with a harpoon, and the Professor experiments with Fish Pheromone which makes him immensely popular with Zoidberg. As Bender does not catch anything, he bends a parasol to get a giant hook and attaches it to the ships Diamond-Filament Tether. As the sun sets, they all pull in their lines and prepare to return home, but Bender's giant hook has attracted a Colossal-Mouth Bass which pulls the PE ship under the waves despite Zoidbergs best efforts to cut the unbreakable tether.

Act II: "A mermaid!"
The bass pulls the ship to the ocean floor, about three miles deep, then escapes from the hook. The crew works to bring the ship back to working order, but the engines will not work under water and there is no food. Leela divides the crew in two teams - she and the Professor will work on the ship's drives, while Zoidberg and Bender, who can both survive at this depth, will look for food as. Fry wants to go with the forage party, which is made possible by the Professor's experimental Anti-Pressure Pill. While collecting food, Zoidberg finds an enormous shell which he adopts as his new home.

Fry, in the meantime, sees a mermaid, but no one believes him. During the night, the mermaid returns and knocks on the window of the crew's quarters, and Fry goes outside to meet her. She gives Fry a device which makes it possible to breathe and talk under water and introduces herself as Umbriel. She and Fry adjourn to a volcanic vent, where Umbriel asks Fry to tell her of the bizarre "landie" world he comes from. The two of them fall in love and travel around on the ocean floor.

The ship is repaired and is ready to depart, but the crew notices Fry's absence and goes looking for him. They find the remains of an ancient city sitting on the bottom of the sea, the legendary lost city of Atlanta, inhabited by an all-merfolk population.

Act III: "Yes, we all miss our loved ones and gases"
The crew is invited to the city, where they find Fry in the company of Umbriel and her father, the Colonel. They learn that Atlanta was once a land-locked city, but chose to move off-shore for the sake of improved commerce. When the city became overcrowded and overweight, it started to sink and many of the inhabitants left. Most remained, and in time, when the city had settled on the ocean floor, they evolved into merfolk with the help of the caffeine from the Coca-Cola bottling plant.

Fry choses to remain in Atlanta as he has fallen in love with Umbriel, and the rest of the crew return to the ship, where they find Zoidberg's shell home mysteriously burned down by one of Bender's cigars. However, when Fry and Umbriel try to make love, it turns out their anatomy is not quite compatible any more and Fry leaves in a hurry. The ship is just about to take off as he catches up, but Fry is able to grab the giant hook and is pulled after the ship. Just then, the Colossal Mouth Bass reappears and swallows both Fry and the hook.

Later, we see the caught bass at the harbour of New New York, and Bender is about to receive a check for $1000 because he has broken the record for the heaviest fish ever caught. The dead fish then releases both Fry and Hermes' Manwich. Although Bender is happy to have Fry back, the bass is now no longer heavy enough to break the record, leaving Bender without the cheque, and Fry in an all-too-tight hug with the angry robot. Zoidberg seems to have adopted the inside of the bass as his new home.

Reception

 * When this episode aired on Cartoon Network, Sky1, and BBC Two, the Professor's line, "Sweet Zombie Jesus!" had the "Jesus!" part muted out, so he only says, "Sweet Zombie..." On TBS, the entire "Sweet Zombie Jesus" line is cut. On FOX, Comedy Central, the DVDs, and streaming online services (i.e., Netflix and Hulu), the line is uncensored.
 * Sky1 also cuts the scene of Bender accepting a suitcase from a shady guy in a jet ski (and his line to Fry and Farnsworth, "Hey, guess what you're accessories to?") after being told that they're on international waters.

Trivia

 * Billy West, voice of Fry, Professor Farnsworth, Zoidberg, and Zapp Brannigan, turned 48 years old the day this episode premiered.
 * When Fry loses his suitcase full of air, you can hear him screaming for help.

Continuity

 * This is the first time we see the interior of the crews quarters on board of the Planet Express ship, the second time is in "Love and Rocket". Various items from past episodes appear, like a model of the space ship Titanic, a pennant from Mars University, the DOOP helmet Fry wore in "When Aliens Attack" (looking suspiciously like a  helmet from Star Wars), a sword Bender probably nicked from Alcazar and what looks like the tutu of the Gender Bender from "Raging Bender".
 * Bender receives a jolt from an electric eel, referring to his previous addiction to electricity in "Hell Is Other Robots".
 * This is the third time we hear Amy speak Chinese, the previous times being "The Series Has Landed" and "Put Your Head on My Shoulders". Amy will speak Chinese again in "Amazon Women in the Mood", Bender's Big Score, Into the Wild Green Yonder, and "That Darn Katz!".
 * The Diamond Filament Tether has another appearance in "The Cryonic Woman".
 * Two mermaids are seen in "Less than Hero" as Fry chases down the purse snatcher.

Allusions

 * The crew encounter a great variety of marine lifeforms on the ocean floor, including a sea horse, an electric eel (much to the pleasure of Bender), an angler fish and a coelacanth.
 * The concept of this episode is a play on the idea of the Lost City of Atlantis.
 * Umbriel's name is a reference to Ariel, the main character in Disney's animated motion picture The Little Mermaid. Ariel and Umbriel are both moons orbiting Uranus, named for two of the sylphs in Alexander Pope's The Rape of the Lock.
 * The unbreakable diamond filament is a reference to Arthur C. Clarke's The Fountains of Paradise, where diamond is used as a building material for a space elevator.
 * Umbriel's father "the Colonel" is likely a reference to founder, as is his suit.
 * There is a reference to the 1972 film , when Bender hums the opening notes to "Dueling Banjos" upon arriving in Atlanta.
 * The song "Atlantis", by episode guest star Donovan, is played early in the episode. The later narration of the history of Atlanta is also a parody of this song.
 * In the story of Atlanta, a Ted Turner statue is shown being mounted above a SeaNN sign, a parody of CNN.
 * The concept of mermaids not having the same reproductive functions as humans is a reference to the mermaid problem. When Fry wishes that Umbriel could have been the mermaid with "the fish part on top and the lady part on the bottom", this is a jab at an episode of Night Gallery called "Lindermann's Catch", about a fisherman who wants to give a mermaid he's fallen in love with legs, but his wish backfires when her fish half becomes her human half and her human half (her head) becomes the fish part.
 * Umbriel and Fry watch a whale and a giant squid wrestle, a reference to the Squid and Sperm Whale panoramic at the American Museum of Natural History.
 * Bender's line that "in the event of an emergency [his] ass can function as a flotation device" is identical to LtCmdr. 's line in  that "in the event of a water landing [he has] been designed to serve as a floatation device". In that movie the floating was accompanied by a rather ridiculous sound and the whole thing was a subject of much derision by fans.
 * As the Planet Express ship is being dragged to the bottom of the ocean the music playing is very reminiscent of "danger" music from the original series of Star Trek. In the very next scene inside the ship the actual "red alert" klaxon from TOS can be heard in the background.
 * As the Planet Express crew is leaving Atlanta, the Colonel says "Ya'll come back now, ya hear?", a reference to the television series .

Goofs

 * The high pressure under water would not allow Fry to carry his oxygen with him in a sack, as shown in the episode - the sack would be instantly crushed.
 * When Leela assembles her harpoon, it screws together the wrong way (lefty tighty).
 * Not every screw is "righty-tighty". Left pedals on bicycle crank-arms, for instance, are tightened to the left.
 * Amy gets a sunburn and has a red skin color right before the ship gets pulled under water. Two scenes later, the sunburn is gone.
 * It's the future. She cured her sunburn with science.
 * Also, Bender writes 'Honk if Bender is great' on Amy's back but in the next scene the words are gone.
 * It is possible that the words were too small to be seen from the distance that the camera was at.
 * When we see the PE ship on the ocean floor, there is sunlight filtering down to it. At a depth of three miles (where they're supposed to be), there would be no light at all.
 * Islands have an underwater portion that extends down to the bottom of the ocean; Atlanta would have sunk immediately if it were placed in the water on a large chunk of earth.
 * Their ship is apparently lighter than the surrounding water (the pressure had to be equalized by water rushing into the ship), so it would not stay at the ocean floor. Fry, the Professor, Leela and Amy would also have risen to the surface.
 * Bender is seen exchanging briefcases with an unknown man on a speedboat after discovering they are in international waters. However, it's been stated in past episode that the Earth government is united by galactic law, meaning Earthican government would have jurisdiction over the entire planet and the idea of "international waters" being a hotbed of criminal activity would be meaningless.

Characters

 * Amy
 * Bender
 * Debut: The Colonel
 * Professor Farnsworth
 * Debut: Farnsworth's grandmother
 * Fry
 * Hermes
 * LaBarbara
 * Leela
 * Nibbler
 * Poopenmeyer
 * Debut: Umbriel
 * Zoidberg

Episode Credits

 * Writer
 * J. Stewart Burns
 * Director
 * Bret Haaland
 * Voice Actors
 * Billy West
 * Katey Sagal
 * John DiMaggio
 * Tress MacNeille
 * Phil LaMarr
 * David Herman
 * DVD Commentary
 * Matt Groening
 * David X. Cohen
 * Rich Moore
 * Bret Haaland
 * J. Stewart Burns
 * Scott Vanzo
 * John DiMaggio
 * Billy West
 * Guest stars:
 * Donovan Leitch
 * Parker Posey