Kunon the Sorcerer Can See, Vol. 3 (light novel)

Genius sorcerer Kunon has gotten his business on track and won the rare honor of concurrent membership in three of the magic school’s factions. Now he plans to start a few joint research projects with his illustrious seniors. An experiment on underwater breathing methods takes him to the bottom of the ocean to hunt for sunken treasure, though Kunon might have found an even greater prize than gold or jewels…The blind prodigy’s repertoire continues to grow as he delves further into the mysteries of magic and defies all common sense!