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You have to get the sea chart from the temple of the ocean king
phantoms are the metal guards in the ocean king temple (the legend of Zelda phantom hour glass) and in the tower (spirit tracks )
beat the the dark temple floor
At the end of the ocean king's temple.
there is not an earth king but there is an ocean king
the hourglass itself
In the ocean temple, Or water temple, You collect the longshot, And the Water Emblem, You also awaken the Sage, Princess Ruto who adds her powers to yours.
there are no floors in the ocean realm.i think your confusing the ocean realm with the ocean temple.
You have to go to the ocean temple and get the next sea chart.
Go to the harbor. Then U talk to the guy on the deck. And then U can go to the temple of the ocean king to rescue lineback.
The Tri-Force
Simple! You just need to get to the bottom of the temple of the ocean king