Wikipedia There is more information available on this subject at Calcutta on the English Wikipedia.
Were you looking for the UNSC Calcutta?

Calcutta, also known as Kolkata, is a large city in the country of India. Several weeks after the Battle of Earth, the city's University Xenobiology Department was hired by the Office of Naval Intelligence to research Forerunner ruins.[1]


  1. Halo: Evolutions - Essential Tales of the Halo Universe, From the Office of Dr. William Arthur Iqbal