Imagine an expansive undersea tunnel with transparent walls, revealing the ocean’s depths. Sea turtles glide gracefully by, surrounded by colorful schools of fish. A majestic shark prowls in the shadows while bioluminescent jellyfish drift nearby, their glow casting an ethereal light. The ocean floor is rich with swaying plants and coral formations. In the distance, the silhouette of a mermaid adds a touch of mystery, blending seamlessly into this enchanting underwater world.