What happened to the two islands that originally comprised te city of Tenochtitlan?

The city of Tenochtitlan, originally built on two islands in Lake Texcoco, was largely destroyed by Spanish conquistadors led by Hernán Cortés in 1521. After the fall of the Aztec Empire, the islands were gradually transformed into Mexico City, with much of the lake being drained for urban development. Today, the area is a densely populated urban center, and the remnants of the original islands are largely submerged or integrated into the modern city infrastructure.