- For the similarly named episode, see Pena Dura.
- "After your tour of duty was up, we were caught behind enemy lines, taken to the darkest hell on Earth. Peña Duro."
- —Eduardo Dorrance to Jim Gordon[src]
Shortly after Jim Gordon left the military, Eduardo Dorrance, Ramirez and several other soldiers were captured by and imprisoned at Peña Duro. Left to die by the government, Eduardo became the sole survivor, later being rescued by "Theresa Walker" and giving him a new purpose.
- "Legend of the Dark Knight: 13 Stitches" (mentioned)
- "Legend of the Dark Knight: I Am Bane" (mentioned)
- In the DC Comics, Peña Duro is an infamous prison located in the Caribbean country Santa Prisca. The prison is best known as the birthplace of Bane, who was born and raised in Peña Duro, serving his father's prison sentence.
- "Peña" is actually the Spanish word for "pain" or "punishment" while "Duro" is the Spanish word for "hard"
- In reality, "Peña Duro" is actually grammatically incorrect. Since "Peña" is feminine, the adjective should be the feminine "Dura", instead of the masculine "Duro".
- Interestingly, the Gotham episode named after the prison, "Pena Dura", uses the gramatically correct version. However, when the prison is later actually mentioned in the episode "13 Stitches", Eduardo uses the incorrect name "Peña Duro", as it was called in the original comics. In the episode "I Am Bane", Eduardo mentions the prison once again. This time he calls it "Peña Dura", using the grammatically correct adjective.