Akish’s Prison is the prison in which Akish confined his son after becoming jealous of him. Akish “shut him up in prison” and kept him there “upon little or no food” (Ether 9:7).
Akish’s son suffered death while confined in the prison (Ether 9:7).
In the text
Ефер 9:7 — Akish starves his own son to death within the prison