 While there really is an area known as the "Golden Grotto" in the  Bahamas (or, more accurately, there WAS such an area, its now been  rechristened to "Thunderball Reef"), the Golden Grotto sharks that  Largo keeps in his swimming pool and describes as "the most  dangerous, the most savage" shark species of them all, are entirely  fictional. The Bull/Zambezi shark is regarded as the most dangerous  to man in all tropical waters.