all i remember is, there were some kids falling through a (vulcano or smthing) for many hours? Then they ended up in a lab with small animals which had 50/50 of an other animal (the one i remember is a spider body and a gorilla torso, like a centaur) later in the movie thse creatures are bigger and outside of the lab. Thank you guys.
“Spy Kids 2: Island of Lost Dreams” (2002)
https://www.imdb.com/title/tt0287717/
Spy Kids 2 or 3