Gravett Island

Gravett Island, located at coordinates 18 136 128, was an isolated and uninhabited island located in Earth's Pacific Ocean. By the 23rd century, Gravett Island was home to one of the highest security prisons on earth. Around Gravett Island is a breeding ground for Mako sharks as well as coral reefs that aren't found anywhere else in the world. When the prison was built, the builders made sure that there was minimal environmental impact and built the prison in the middle of a large volcano.