the most "notorious example of the extreme social isolation found in supermaximum custody units" is the shu at southport nydocs upstate correctional facility & pelican bay state prison. from studying conditions at pelican bay, researchers argue that long-term social isolation "carries major psychiatric risks." prisoners are susceptible to developing mental illnesses because they are confined to coffin-like conditions and denied access to basic health services. illnesses range from anxiety, clinical depression, and self-mutilation to suicidal thoughts and shu syndrome. yet, it is important to note that the duration of the isolation is the most important factor in determining the effects of solitary confinement.