MCRN Hammurabi (EML-05) is a warship of the MCRN. The ship appears in both the books and TV show, however it is different type of ship between medias.
MCRN Hammurabi was a frigate that entered with the fleet into the Slow Zone. Marines from the ship entered the ring station in pursuit of James Holden. After his capture, Holden was taken onboard the frigate and interrogated until later being taken to the Behemoth.
MCRN Hammurabi (EML-05)is a Scirocco Class Cruiser in the Martian Congressional Republic Navy. The Cruiser recovered the survivors of the Kittur Chennamma and upon receiving intel of a conspiracy within the UNN Captain Kirino set the ship on an intercept course with the UNN Agatha King.
Captain Kirino, having witnessed the UNN fleet falling into a Civil War, orders the MCRN fleet not to engage any UNN vessel and contacted the UNN ships offering a truce and help to any that needed it.
Hammurabi survived the Battle of Io, and was later part of the joint UNN, OPA and MCRN fleet sent to investigate the Ring megastructure that the protomolecule constructed in orbit beyond Uranus. When Manéo Jung-Espinoza approached the ring in his racing ship Y Que intending to fly though it, the Hammurabi was the ship that warned him to vacate the area or be fired upon.