Pinnacle Rock

Pinnacle Rock
Pinnacle Rock is a place found in the Great Bay, full of mist and signs found on the sea bottom. Beyond the signs, the lair of the Sea Serpents can be found, a deep hole in the sea filled with predators, all of them Serpents.

The way to get through Pinnacle Rock without the seahorse's assistance are:

Stop at the first sign, go to the second one on the right, go one forward, head to the left until another sign comes into sight, one up, one right and then into the lair.

Getting out this same way is quite difficult; it is far easier for Link to simply swim out a random way and magically wind up back at the entrance to Pinnacle Rock.