Used Diving Watches

Can anyone from Australia or New Zealand remember this TV show?
I was thinking that children are used to in New Zealand or Australia and I can not remember what was called and it's driving me crazy. It was at this gir and had a pearl or something from a boat of his grandfather to work / and surf on it and his friends used to go diving, (I think he had a map), looking like pieces of something when everything fit together and that could open a box or maybe there was something in this pearl, and I think one of the girls, which really stuck and Picardy and am not sure, but for some reason I think his father owned a zoo lol. Does anyone know the show I'm talking about? Sorry, wrong category!
hmm … not sure, but maybe ship to shore, the island of pirates or the ocean girl …
Watch Over Me [Bella - Cliff Diving]