Learn the Secret
After reaching Zora Village, make your way to the Gale Tree in the present. From there, swim north two screens and west a screen to find the Master Diver's Pupil on the island. Talk to him and he will recognize Link as also being one of the Master Diver's pupils. He will tell Link a secret and asks him to relay the message to the Master Diver in Sunken City within Oracle of Seasons.
Tell the Secret
Back in Oracle of Seasons, warp over to the Sunken City. The Master Diver is now back in his house, which is located at the west end of the Sunken City, near the entrance from the Natzu region. Inside the house, speak with the Master Diver and he will ask Link if he needs anything. Tell him the secret and he remembers his Pupil from Labrynna. He offers to give Link a gift, but only if he can first pass his test.
The Master Diver will give Link a quest. He will need to walk down the staircase that appears. Link will need to swim through the underwater maze and reach the star at the end within 30 seconds. If Link takes too long, the Master Diver offers him another opportunity to try again. It is actually quite a tight time limit, so you'll need to get the pattern down and swim as quickly as possible. You only ever want to slash your sword if it is absolutely necessary. Otherwise, just avoid the enemies.
For completing the race in 30 seconds or less, the Master Diver will give Link a Magical Ring. The Master Diver encourages Link to take it to Vasu Jewelers in Horon Village. When appraised, it will become the Swimmer's Ring. When worn, this will increase Link's speed while swimming.
In order to get the Swimmer's Ring reward in Oracle of Ages, Link will need to talk to the Red Snake in Vasu Jewelers. Chose 'Ask' and the Red Snake will give Link a password. Jot the password down and then return to Vasu Jewelers in Lynna City. Speak with the Red Snake once again, but this time choose 'Say'. Input the password and this will bring over all of the rings Link has in Oracle of Seasons including the Swimmer's Ring.
Talk to the Master Diver's Pupil to get the secret
Tell the secret to the Master Diver
The Master Diver will give Link a Magical Ring
Use the Red Snake to transfer it to Oracle of Ages
- ↑ "Say, aren't you a pupil of the master diver in Holodrum's Sunken City? I have a secret I'd like you to tell to your master. Will you do it? ›Yes ›No" — Master Diver's Pupil, Oracle of Ages.
- ↑ "I'm counting on you!" — Master Diver's Pupil, Oracle of Ages.
- ↑ "Pupil! Do you need something? :›Yes ›No" — Master Diver, Oracle of Seasons.
- ↑ "Hmph! ................ Labrynna, huh? He's my senior pupil. It's nice having pupils all over! I'm in a good mood, so I have a gift for you... If you can pass my test! Will you try? :›OK ›No" — Master Diver, Oracle of Seasons.
- ↑ "OK. Here's how it works." — Master Diver, Oracle of Seasons.
- ↑ "First, go down the stairway I'm about to open. I put something way in the back. If you can get it before time runs out, you'll get a prize! :›OK ›No thanks" — Master Diver, Oracle of Seasons.
- ↑ "You took :! Too bad!!! Do you want to try it again? :›Yes ›No" — Master Diver, Oracle of Seasons.
- ↑ "
- ↑ "Only my pupil could do it! Here's the prize I promised you!" — Master Diver, Oracle of Seasons.