According to the Geosyncline theory, the Tethys was a massive depression that collected sediments from surrounding landmasses for millions of years. When the Indian Plate collided with the Eurasian Plate, these accumulated sedimentary layers were “squeezed” upward. Geographically, this explains why marine fossils, such as ammonites, are found at high altitudes in the Himalayas today. The Tethys acted as the “cradle” for the mountains. As the sea disappeared, the compressed seabed became the highest mountain range on Earth, proving that the world’s tallest peaks were once submerged under water.