- Kotaro Tanaka (The owner, IANTD & PADI Instructor, & Chief guide)
- Over 20 year experience in Hachijyo since I was with college.
Fascinated by "Hachijyo Grand Blue", and he started Concolor in 2002.
Kotaro is IANTD & PADI instructor & chief guide, and also professional underwater photography.
He found and introduced some undescrived spices to the academy.
- Kanta Hamachi PADI Instructor

