“We didn’t want a grim, muddy jungle,” Tildesley explains. “Dora sees the jungle as a playground. So we pumped up the colors—emerald greens, bright golds, shocking red flowers.”
“We mixed two tons of rolled oats, water, and green food coloring in a tank,” reveals special effects coordinator J.D. Schwalm. “It has the exact viscosity of quicksand—slow to sink in, but impossible to move quickly.” dora and the lost city of gold behind the scenes
To create Swiper’s signature blue-and-black mask, the effects team designed a practical suit covered in subtle blue LEDs. Del Toro would creep through the jungle set, completely silent, while the actors had to react in fear. “He’s this Oscar-winning actor, and he’s full-on sneaking behind a fake bush in a spandex suit, whispering ‘Swiper, no swiping!’” recalls Merced. “It was surreal and amazing.” In one of the film’s most memorable sequences, Dora teaches her city-slicker cousin Diego how to escape quicksand. On screen, it looks terrifying. Behind the scenes? It was a giant pool of oatmeal. “We didn’t want a grim, muddy jungle,” Tildesley