Yes, there are many of them, but some are extremely hard to find
Go to Halopedian.com. Best source for all Halo information.
If you beat the last level on Legendary, during the final cutscene if you hold down the right analog stick you can see Either Master Chief or another spartan in a cryo pod.
Just search it up on youtube, and also, if ur new to halo, try the monkeys and exo-arms first, the elephant isn't worth it.
u press the big X. then go on party then press the blue x