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索恩杜洞（Son Doong）是越南的一个洞穴系统，被认为是世界上最大的地下洞穴之一。这个洞穴位于越南中部的昆仑省，是一处令人惊叹的自然奇观。洞穴的主洞穴长约5公里，高度达到200米，宽度可达150米，内部有河流、瀑布和森林等丰富的自然景观。

首图prompt：

Craft an enchanting background illustration that perfectly complements the stories of 'Splashie and the Ocean of Mysteries.' Create a captivating underwater scene that immerses the viewer in the beauty and wonder of the ocean's depths. Use a harmonious palette of blues and greens to evoke the serene yet vibrant atmosphere of the underwater world. Depict intricate coral reefs that teem with colorful marine life, from delicate seahorses to majestic sea turtles. Let the water's surface above be adorned with dancing reflections of sunlight, casting a golden glow.