Earlier parts:
Part 1: link

Part 2: link

Part 3: link

Part 4: link

Part 5: link

Part 6: link

Part 7: link

Part 8: link

Part 9: link

Part 10: link

Part 11: link

Part 12: link

Part 13: link

Part 14: link

Alexandra was once again back at the room with the 10 doors which now consiststed of 4 doors. She grabbed the key and opened the door and went inside.

Now she was standing at a beach not far away from a castle, but she thought that her next princess lived in the castle, but when Erica explained Alexandra was wrong:
"Your next princess lives under-water so we have to transform ourselves into mermaids", she said.

Erica looked for a wand and found it, then she waved the wand onto Alexandra so that she became a mermaid and then Erica waved so that she became a mermaid too and then they dove into the ocean and after a few minutes they saw a huge castle.
"This is Atlantica, your next princess lives here", Erica told Alexandra.

When they stepped inside they saw how 6 mermaids performed a song and then they opened a sea-shell, but it was empty and when they turned around they saw a merman.
"Those that performed are the sisters to our next princess and the man over there is their father King Triton, looks like our princess is looking for human treasures, she wants to be a human", Erica said.

Alexandra and Erica swam to look for the princess, but it was very hard to find her so after a few hours they where happy to find her.
"Her name is Ariel, she was supposed to sit in that sea-shell in the concert, but she's more interested in looking for new treasures for her collection", Erica said.

They followed her into a ship that looked like a haunted mansion in the ocean.
"Her fish friend's name is Flounder, he doesn't like sharks", Erica continued.

Suddenly Ariel discoverd a fork that she wanted to show for her friend Scuttle.
"Scuttle is a sea-gull that seems to know all about the human treasures, but in fact he doesn't", Erica told Alexandra.
"Maybe we can tell her what all of these treasures are called and explain what they're used for", Alexandra asked.
"That sounds like a great idea", Erica answered.

Suddenly they saw a shark and they had to swim out from the ship, but they managed to come out without no problems. When the shark was captured the girls introduced themselves to Ariel.
"We know how much you like the human world, but also how little you know about the names of the human treasures that you've found so we decided to tell you what the names of them are", Erica said.

Erica was the one that had helped Ariel learning the names of the treasures and what they where used for and now she did it again.
"This is a fork, you use it to grab the food that you eat, well if you get the chance to be a human we can show you how it really works", Erica told Ariel who seemed interested.
"Okay, but what's this then", Ariel asked holding up a J-formed chair like thing.
"This is a pipe, elder people usually use them to blow out smoke from. They light them up with a match and then they just blow", Erica continued telling Ariel.
"Great things, I'll look for new things tomorrow", Ariel told the girls.
"Well, do it tomorrow cause we better hurry for your concert", Erica said.
"Oh, you're right, we better hurry", Ariel said.

When they arrived at the castle Alexandra and Erica hided so that they didn't became discoverd, but so that they could see Ariel and Triton having a conversation. Ariel told her father that she didn't mean to miss the concert. Flounder told Triton about the shark and since they hadn't been up to the surface Triton wasn't very angry at Ariel, but he told her that next time there was going to be a concert she had to be in time and so she swam away and so did Alexandra, Erica and Flounder do too.
(End of Part 15)