R'lyeh

"Okay, how about now?"
"No, no, no. Are you sure you're pushing the right buttons?"
"Aye. Dagon, Shub-Niggurath, Dagon, Cthulhu, Dagon, Cthulhu. Let me try again..."
The third person, a woman, spoke up, "Are you even sure you translated the thing properly?"
Ilran replied, "Yes. As sure as Cthulhu fhtagn."
Haythan flinched. "I hate it, the amount of time we're taking. I rather read the Necronomicon."
Lianor replied, "Hey, don't remind what it took us just to get that damned book, yeah?"
Ilran moved around the carvings in the small and enclosed cavern. They had taken a long time just to get to this chamber in R'lyeh, or at least, what they assumed to be R'lyeh.
Ilran carefully went around the statue of the three deities. (Not actual deities, just powerful beings worshipped by the Esoteric Order Of Dagon, except for Shub-Niggurath)
"Okay, I'll try again."
"And hopefully we won't die of incredible hunger or massive sanity loss."
"That's why we have our food and amulets with us, Haythan."
"Alright, Dagon, Shub-Niggurath, Dagon again.." So saying, Ilran pushed the buttons one by one.
Lianor went to the tablet at the side and started translating it.
"Damn, it still didn't work!"
"That's cause you translated it wrong, idiot. You completely botched it up. The sequence is Cthulhu, Shub-Niggurath, Cthulhu, Dagon, Cthulhu, Dagon. The eye indicates Cthulhu, not Dagon. How did you make such a mistake?"
"Huh. That's weird. I thought the eye looked like Dagon's symbol. They get confusing if you stare at them for too long."
"C'mon Lianor, it's a forgivable mistake. This is R'lyeh we're in, so I suppose Ilran did see it wrongly."
"Man, shouldn't we be protected from these stuff since we are devoted to Cthulhu? I won't say worship 'cause he's not actually a god."
"Well, Cthulhu drives anyone mad so it would make sense."
Meanwhile Lianor was pressing the buttons in the proper sequence. The door ahead of them creaked and groaned open.
"Finally! You know, with all these traps and puzzles, one would think Cthulhu doesn't want to be freed."
"It's to make sure whoever frees him is worthy."
"I'a Cthulhu."
They entered a room with an archway ahead of them against the wall.
"Oh, I know this one."
"Okay, let's see how you do, Haythan."
Haythan stepped forward and lifted up an amethyst pendant with a gold that was not quite gold around it but some kind of whitish gold.
"V'hu-ehn n'kgnath fha'gnu n'aem'nh. V'glyzz k'fungn cylth-a v'el cylth-Cthulhu k'fungn'i. I'a rygzengrho. I'a Shub Niggurath. I'a Dagon. I'a Cthulhu."
With a flash, the archway burst into light. A portal had opened.
"Well, we might as well get going. R'lyeh is rather huge."