He can only become invisible to the Phantoms. In the Temple of the Ocean King if he stands on special purple areas the Phantoms cannot see him. Another benefit of these purple areas is the Phantom hourglass timer stops while he is standing on a purple area.
go to zeldauniverse.com and click on " Phantom Hourglass"
go to www.zedladungeon.net
You go to osha and he fuses the hourglass with the blade
to get a cannon you have to go to cannon island
To her sister the "Mermaid"!
*Caution- Major plot spoilers are included*The Phantom Hourglass is a magical artifact that allows you to go through the Temple of the Ocean Kingwithout losing any life. However, the Phantom Hourglass, as the name states, is an hourglass, and therefore, gives you a timed speedrun of the Temple of the Ocean King. There are 50:00 Minutes maximum that you can collect by finding the Sand of Hours. you will go to the heart of the temple at the end of the game to defeat Bellum, the Evil Phantom. Using the Hourglass, you will get the Phantom Sword.
go to the temple of the ocean king and draw a triforce instead of an hourglass and the get thenortheastern seachart
go on to ign.com then click on Zelda walkthrough
go to the temple of courage
you go into the temple of fire and its there
go find golden frogs
you get the bombchus when you go through the temple on the gorons isle