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Rock Bottom is a small city in a deep sea trench located beneath Bikini Bottom. The road between the two cities is so perfectly vertical that it can only be accessed by a bus or balloon. The city is first seen in the episode "Rock Bottom" and makes other appearances in the franchise afterwards. It has been confirmed that Rock Bottom will make multiple appearances over season ten and eleven.
Sunlight does not 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 green with living sludge that can talk. Most residents of Rock Bottom are bioluminescent. They speak a language nearly identical to English, except that they blow raspberries between most words and sentences.
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 has attempted to be first in line, but the residents scare him so badly that he is 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 Appearances
Rock Bottom is featured in several SpongeBob video games. The city's first appearance in a video game is 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 and a soda bar called the Rusty Anchor, run by a muscular fish named Big Mac. The weather wizard of Rocky Town, named Marlin, lives there.
In Battle for Bikini Bottom, the Rock Bottom Museum is the 6th level to be accessed in order. 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 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 hadopelagic zone. If this is the case, then SpongeBob and Patrick, being foreigners to this part of the ocean, should keel over and die as soon as they set foot in the city; the temperature in this zone is often below freezing, and the water pressure should be around 8 tons per square inch.
Rock Bottom made its second in-series appearance in the episode "Out of the Picture" in Season 10, being the city's first appearance in 17 years.