BULIC: Ready to fire, Commander. BULIC: The Doctor and the girl are trapped in the airlock. DOCTOR: I did try and warn you. DOCTOR: Trust me. It is time to begin. That's a Silurian battle cruiser. The safety of the Base depends on it. VORSHAK: You're telling us not to defend ourselves?
Plan: A: a tentative trust; Q: What is the Doctor starting to gain from the humans of the underwater military base? A: an unknown cruiser; Q: What does the doctor recognize and warn the humans not to fire upon? A: the Doctor; Q: Who warns the humans not to fire on the unknown cruiser? Summary: Just as the doctor is starting to gain a tentative trust from the humans of the underwater military base, an unknown cruiser appears and the Doctor seems to recognize it and warns the humans not to fire upon it.