I have been to Gab Gab and Gab Gab2 many times. I think this is a great dive location for all levels. I helped with people getting their open water and advanced open water certification here. I did my Peak Buoyancy here. The entry is from a swimming pool-like structure which goes out into the ocean. There is then a drop off at a beautiful wall. This is Gab Gab. If you were to swim straight out, you would hit another reef structure which is Gab Gab2. You should not actually surface dive to Gab Gab2 because you are crossing an active sea lane. (You are actually required to go to 20 feet for the crossing, but people do go over on the surface anyway.) It is best to do this dive with the MDA shore dive group since they are very familiar and give great briefings and guides.