"I would like to visit Mac, the Sea-King", you say. The seal, without a word, takes you underwater, and you descend deeper and deeper. Finally you come to a castle. Two poisonous lionfish* stand guarding the palace, brandishing their poisonous spines. Immediately, the seal says some sort of code: ODORI MOSTACCIOLI AMBROSIA NAMASTE.
The lionfish open the door to the castle, letting you and the seal in.

*Lionfish: any of several species of tropical saltwater fish who possess poisonous fin spines. This poison can make a human ill for more than 24 hours straight.