Head back to Great Bay Coast after collecting the first four Zora Eggs and a picture of a Gerudo Pirate. Swim to the Marine Research Lab and climb up the ladder to reach the top of the tank. Release the Zora Eggs into the tank then you can leave.
Head to the Fisherman’s Hut , the right house along the coast, and speak with the Fisherman. Hand over the picture to receive the Seahorse, a friend we’ll be using shortly.
Entering Sea Snakes Lair
Swim to the two large pointy rocks in the middle of the water, just north of the Marine Research Lab. Here you’ll meet a Zora that needs a gold seahorse for guidance through Pinnacle Rock .
Swim between the rocks to enter the next area then release your Seahorse friend. Follow him through the area, which is to say you’re really just following the arrows that point the way, and you’ll reach the Sea Snakes’ Lair.
The Final Three Zora Eggs
The Seahorse wants to rescue his friend, but you only need to defeat the Sea Snakes that guard the Zora Eggs. Defeating them all is worth the time though so start with the top two.
To defeat the Sea Snakes you’ll need to swim near their hole and use Electric Barrier to hit them or stand at the mouth of their hole and use Double Cutters, either way it takes two attacks.
There are eight Sea Snakes in total, be sure to defeat them all and loot the chests in their holes as well as the three Zora Eggs .
Once you’ve defeated all eight Sea Snakes your Seahorse friend is reunited with his love and they give you Piece of Heart #26 .
Return to the Marine Research Lab and release the last three Zora Eggs into the fish tank then hop down. Stand near Doctor Mizumi and pull out the Zora Guitar to learn the New Wave Bossa Nova .