Personnel of the Kobayashi Maru. Several casualties were sustained as a result of the ship hitting a gravitic mine.
The crew of the Kobayashi Maru numbered 81. One member of the crew made the distress call. (Star Trek II: The Wrath of Khan)
The crew complement was only mentioned in writing.
The voice on the comm might have been Vance, although it was never identified as such.
Three hundred passengers were also aboard the Kobayashi Maru. (Star Trek II: The Wrath of Khan)
These passengers were only mentioned in dialogue and writing.