Crimson Hell is the first level of Impel Down in which prisoners are kept. The level houses the least-infamous prisoners and contains a large forest of red trees. The leaves of the trees, known as Kenju, are as sharp as blades, while the grass on the floor, the HaribarisÅ , is as spiky as needles. Here, prisoners are forced to run through the forest while being chased by poisonous spiders and guards to experience all the pain from being cut from all directions. As a consequence of prisoners being forced through this forest, it is soaked in blood.
Deep within the forest is a hole that leads to Level 2. For those who do not wish to live through the pain of being cut any longer, they were given the option of jumping down the hole to Level 2, which contains an even more terrifying hell that nobody is willing to risk. The security here seems to be somewhat lax.