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Rock Bottom is a small city in a deep sea trench located beneath Bikini Bottom and only appeared in the episode, "Rock Bottom." The road between the two cities is so perfectly vertical that it can only be accessed by a bus or balloon.
Sunlight doesn't reach this part of the water, so everything is always pitch black except for a few street lights. Signs are written in a language based on English except with the letters distorted, inverted, or in a different orientation. The soil is a green, living sludge that can talk. The residents of Rock Bottom are bioluminescent and appear strange and monstrous, being based on real-life creatures found in the deepest areas of the ocean.
They do speak English, except they blow a raspberry at the start, middle, and/or end of a sentence. Rock Bottom made a second appearance in the "SpongeBob SquarePants 4-D" theme park 4-D ride.
The entry area of Rock Bottom contains a "Kandy" machine. The road that leads back to Bikini Bottom and restrooms, although foreigners cannot tell which is the men's room and which the women's due to the weird symbols used to mark them, and are unable to determine the genders of the inhabitants.
Rock Bottom also has a major bus station, although the bus is extremely hard to catch. There is also an information booth, with extremely long waiting lines. SpongeBob once attempted to be first in line but the residents scared him so badly, so he was forced to be 329th in line.
There is also a police station and a prison, as seen in SpongeBob's Boating Bash. There are many billboards throughout the town. The signs on the bathroom doors have question marks on them.
Video Game Appearaces
Although it makes only one appearance in the show, Rock Bottom is featured in several SpongeBob video games. Rock Bottom makes it's first appearance in a video game in Legend of the Lost Spatula.
In Employee of the Month, Rock Bottom is the location of the game's second chapter. It also includes a TV network WSEA with weatherman Gary Gulper. Plus a soda bar called the Rusty Anchor, run by a muscular fish named Big Mac. Also, the weather wizard of Rocky Town named Puff Puff lives there.
In Battle for Bikini Bottom, the Rock Bottom Museum is shown. It features a lot of artwork and has an advanced security system, and Barnacle Boy works as a security guard there. The Trench of Advanced Darkness is a trench that is lower than the city itself. There is also a spoof on the game where SpongeBob goes for a kelp bar and a bus goes by.
In The Yellow Avenger, this is where you find The Flying Dutchman. You can also see the bus station, which is accessible. There is also a Giant Anchor, a vending machine can be found inside the bus station.
Rock Bottom's creatures are based off real animals.
Rock Bottom likely has the lowest sea level of any of the cities in the Pacific Ocean since it is located in a trench.
Rock Bottom has an appearance similar to the monster infested trench on the way to Shell City.
Rock Bottom is most likely located in the Pacific Ocean's Hedalpelagic Zone. If this is the case, then SpongeBob and Patrick, being foreigners to this part of the ocean, should have froze and then died as soon as they set foot there because the temperature in these parts of the ocean tend to be below freezing, and the water pressure should be around 8 tons per square inch.