I was initially interviewed for an internship role, and was offered the interview after applying via their job application site. The interview was relaxed and conversational, and beyond the interview there were additional security clearance applications associated with the role. A secondary interview was conducted for my current role, where there was an informal interview initially, then a formal assessed interview afterwards. This was an internal interview, so no further assessments were needed after.
Questions around safety culture, how you manage time, and how you work with other people. There were some technical questions, especially in my second interview, and it was encouraged to be honest if you didn't know.
Interviewing isn't about repeating what is on your resume, and generally the people interviewing you can see through any persona you might put up to appear more confident, skilled, etc. It's best to be up front and honest, and to ask questions. Also, its a good idea to ask at the end of the interview if there was anything you can do to improve or anything you did well. It shows that you are self-aware and are open to constructive criticism.