Golden Scale
From Zelda Wiki.org
Golden Scale
The Golden Scale allows Link to dive deeper than he could with the Silver Scale. With it, he can dive 9 meters. It is obtained in Ocarina of Time by catching a 20 pound fish at the fishing hole in Lake Hylia as an adult. With Link, can dive to the bottom of the water in the Lakeside Laboratory and receive a piece of Heart. The item is completely optional and is not needed to complete the game.
