bp Process Engineer Intern interview questions

Applied online and then received a call scheduling a phone interview. Completed the phone interview (20 minutes) very simple, just what are your interests/experiences not hard at all. Received request for face to face interview and was flown out to Texas City for on-site interview. Day long event included several powerpoint presentations about BP benefits and culture, etc. Then a plant tour followed by a 45 minute personal interview and a 45 minute technical interview. The personal interview was exactly what you would expect with a strong focus on experiences within a team setting. Questions about a team meeting adversity, what did you do, a team succeeding what role did you play, etc. Technical interview was weird my question was you are in charge of building a pipeline from the ocean to a refinery 200 miles away and there is a mountain range in the way, what issues are involved here? Then you just talk them through the project and they observe your thought process and what issues you worry about and how you address them.