Indiana Prison and Jail Specific DiscussionsThis forum covers topics & discussions specific to Jails and Prisons located throughout the State of Indiana.
Sounds like it's a segregation unit, usually used when someone has broken a big rule.
It's the same as solitary confinement, if my guess as to the definition is correct. I can't speak specifically for Indiana, but in Oregon, they can be held there, with no mail, no phone, no personal possessions for up to 30 days while an investigation is conducted.
I'm very sorry your friend is going through this. The best that can be said about "the hole" is that he's safe.