"Yes. I have spoken to him and seen him, here." Other people have seen him too. Bucky holds on to this, he knows Steve is real. Or....this ship and everyone on board it are the result of an illusion recreated by Hydra.

He steps back, glowering and suspicious. Separated from the drugs Hydra has used to control him, Bucky is feeling the withdrawal and he doesn't know it.

"I will tell you his room. You can see for yourself, once you've cleared quarantine.