As the friends were admiring their newfound treasure, Lily noticed something strange on the wall. It was a small, hidden trapdoor that they hadn't noticed before. Excited by the possibility of even more treasure, the friends quickly made their way over to the trapdoor.

With a bit of effort, they managed to open the trapdoor and were met with a dark, narrow staircase leading down. Without hesitation, they grabbed their flashlights and began their descent. As they made their way down, they could hear the sound of rushing water getting louder and louder.

Finally, they reached the bottom and found themselves in a large underground cavern. In the center of the cavern was a pool of crystal clear water, with a small island in the middle. On the island, there was a pedestal with a glowing object on top.

Curious, the friends cautiously made their way over to the island. As they got closer, they realized that the glowing object was a beautiful, golden key. Without hesitation, they grabbed the key and made their way back to the surface.

Back on the surface, they examined the key and noticed that it had a symbol engraved on it. They remembered seeing the same symbol on the map that led them to the cave. Excited by the discovery, they quickly made their way back to the cave and used the key to unlock a hidden door.

Behind the door, they found a room filled with even more treasure. But this time, it wasn't just gold and jewels. There were ancient artifacts and valuable relics from different parts of the world. The friends were amazed by their discovery and couldn't believe their luck.

They decided to take some of the artifacts and relics back with them, along with the rest of the treasure. As they made their way back home, they couldn't stop talking about their incredible adventure and all the amazing things they had found.

From that day on, the friends were known as the brave adventurers who not only found the lost treasure, but also uncovered a hidden underground world filled with priceless treasures. They were proud of themselves for never giving up and always being open to new adventures. And they knew that they would always have each other's backs, no matter what challenges they may face in the future.

The end.