You would think that Fear Street Part 2: 1978 would be primarily inspired by Lights Out, the book that takes place at Camp Nightwing, but that's not the case as it actually has more in common with Trapped. After getting detention at Shadyside High, a group of teenagers decide to explore the hidden tunnels under the school. They should've believed the stories about the deaths of the kids partying in the tunnels during the '60s, because history has a way of repeating itself.
From the never-ending tunnels under the school to the red mist that seems to mean danger, it's easy to make the connection between Part 2 and Trapped. However, instead of Shadyside High and red mist, the tunnels are now under Camp Nightwing and red moss is a warning sign for the movie. Both Elaine from Trapped and Alice from Part 2 find themselves battling ankle issues as they try to escape the tunnels after a cave-in, although Alice's are a bit more gruesome. Skeletons coming back to life are also a big and deadly issue for both sets of teenagers.
Also, a name being carved into a rock alerts the protagonists that something fishy is happening in the tunnels of Shadyside. Part 2's names are just signifiers of potential killers, while Trapped has a solitary name responsible for the deaths of the kids in the '60s.
Part 3 takes the moral of Trapped's story, which is "the truth will set you free," to the next level. Once Deena and Ziggy realize it's been Nick and his family who've caused all the pain and suffering in Shadyside, they're able to use the Shadyside Killers to their advantage. Deena, with the help of Sarah Fier, eventually kills Nick and sets the town free from the witch's curse.