Underground cavern construction timelapse in Nano Banana 2 and Hailuo 2.3

Cinematic ultra-realistic construction timelapse inside a massive underground cavern. The scene begins as a rough excavation site with rock walls, cranes, excavators, scaffolding, rubble, and workers in helmets operating heavy machinery. Machines rapidly clear rocks while crews drill, pour concrete, and install steel structures.

Terraces, pathways, and platforms quickly appear along the cavern walls. Glass railings, modern structures, and smooth stone flooring are installed. Landscapers add plants and small trees while a central water canal forms. Warm architectural lighting gradually illuminates the cavern as heavy equipment disappears.
The space transforms from an industrial construction site into a refined underground luxury environment with glass residences integrated into the rock, terraces overlooking the water, and elegant walkways connecting levels.

Final scene: a calm billionaire underground living space with glass bridges, modern homes, greenery, water features, and soft warm lighting, same camera perspective.

Style: hyper-realistic cinematic construction timelapse, smooth transformation, architectural realism, 4K detail.