Trekipedia

Rura Penthe

Frozen planetoid used by the Klingons as a high-security prison camp.^[1] Rura Penthe was located in the Mempa Sector of the Beta Quadrant, approximately 11.5 light years from Qo’noS.^[3] The prison was located underground as the surface weather was inhospitable and unable to support humanoid life. The conditions on Rura Penthe meant that being incarcerated there was as good as a death sentence, as many prisoners were forced to work under terrible conditions in the dilithium mines.^[1] Captain Jonathan Archer was imprisoned a short time at Rura Penthe before being rescued by his crew in 2153.^[2] Captain James T. Kirk and Dr. Leonard McCoy also served time on Rura Penthe, after being falsely accused of assassinating Chancellor Gorkon in 2291.^[1]

ST11 Timeline

After traveling through time from 2387, the Romulan renegade Nero and his crew were captured in 2233 by the I.K.S. Klothos, under the command of Captain Kor and imprisoned at Rura Penthe,^[5] where they remained in captivity until their escape in 2258.^{[4, 6]}