Here are some options, depending on the situation:
For strong emphasis:
* Hades: From Greek mythology, this is the underworld.
* Abyss: A bottomless pit, suggesting a place of immense darkness and danger.
* Perdition: Eternal damnation or spiritual ruin.
* Inferno: A fiery place of torment.
* The depths: Suggesting an unknown and terrifying place.
For less dramatic situations:
* A terrible place: A more neutral description.
* A nightmare: Suggesting something unpleasant and frightening.
* A disaster: For situations where something has gone very wrong.
* A mess: For a more casual and less dramatic approach.
For comedic effect:
* The place with all the angry squirrels: Humorous and unexpected.
* The underworld: Used ironically.
* The bad place: A simple, funny alternative.
Ultimately, the best word to replace "hell" depends on the specific situation and the message you want to convey.