Um, the spartans stuck in sheild world ARE the ones referred to be in there after Halo 3. Yeah I am pretty damn sure that they won't find a way out of there in the few months from then to when Halo 3 ends. Also, the Gray team (in the Cole Protocol novel) is still missing, no one knows where they went. Linda, Kelly, Dr. Halsey, and the 2 spartan 3's (their names escape me, but its the male and female that always hung out with eachother, the female doesn't speak after the traumatic event the two went through), and the 3 or S3's stuck in suspended reality in the covy pods, they are the only ones I know of, but I do know they should be perfectly fine because they are stuck in an area thats like installation 04.