What are the three ways that the narrators captors attempt to kill him in The Pit and the Pendulum?

In "The Pit and the Pendulum," the narrator's captors attempt to kill him in three distinct ways. First, they use a pendulum with a razor-sharp blade that swings slowly closer, threatening to slice him. Second, they try to force him into a pit filled with darkness, implying a terrifying death by falling. Finally, they set the walls of his cell to heat up and close in on him, intending to crush him between the fiery walls.