Brian Mara and the rest entire Dive Oahu team are true professionals. Brian and his team provide excellent support and training. I was coming from Okinawa, Japan for military matters and while I was on Oahu, I wanted to complete the IDC and IE, Brian was able to skillfully develop a schedule that ensured I was able to address my military matters and complete my training. I always tell the story about the world class experience with Brian and his team. If being an Open Water Instructor is your goal, I enthusiastically recommend Brian and his team!