I dove with Rudy Ricour and had an incredible time! What a fantastic instructor; patient and a good teacher, in addition to adding a load of fun to the course. I did both the intro course and the advanced course at Big Blue with Rudy and couldn't recommend the experience more. If you're looking to dive in Koh Tao, Big Blue is the place to be! And if you're lucky you might land on the best instructor they have, Rudy!!