ITEMS TO GET: None

    Swim to the northeast corner of Great Bay, noting the small corridor in that area shown on your map. Find the planks by the sea floor marked with a skull and crossbones (there are four) and swim into the second one from the left. Enter the passage and you'll be inside the Pirates' Fortress.

    Swim to the midpoint of the north wall and run up the ramp to the switch. Goron Pound it to open the grate in the southeast, then swim through it. Break the plank inside by swimming into it, push the large grey block forward, then pull the other grey block towards you and away from the wall. Go back to the area between the plank and first block, head to the left and break two more planks, then swim behind the block you pulled away from the wall and go up the air current to the surface.

    Swim underneath the horizontal air current while avoiding the mines, then open the door and avoid a few more mines while heading up the ramp and out of the water. You'll see a crystal switch on a platform at the very top of the room, but first destroy the barrels in the back corner with Goron Punches to clear a path to the floor switch. Activate it to access the heart piece inside the cell. Next use Zora Link's fins to activte the crystal switch and exit through the grate that opens.

    Stay along the surface to avoid yet another air current, then climb up the long ladder. Switch back to normal Link and arm yourself with the bow. Step on the floor swtich and run over to the grate, then nail the exposed wall switch with an arrow and ride the water spout upward. Note the barred door, then climb another long ladder and use the telescope to take stock of the Gerudo guards outside.

    When done, face directly away from the telescope to see a platform obscured by mines. Use an arrow to knock the mines into each other, then hit the switch with another arrow and jump down to the (formerly) barred door. You'll now find yourself back outside, across from the first switch you hit with a Goron Pound. Taking care not to fall into the water, run north along the wall and into the interior of the fortress.