The Secret Explorers (Book 14): The Secret Explorers and the Cave Crisis, SJ King

Meet the Secret Explorers – a band of brainiac kids from all around the world, here to take young readers on a series of fact-filled fictional adventures! Each with their own specialty, from outer space to dinosaurs, these young globetrotters will teach kids aged 7-9 that learning can be fun, encouraging them to become experts in something they love. 

In this story, Leah the biology explorer and Cheng the geology expert are  sent on a daring mission to a network of caves in India. However, when they get there they realize there’s more to this mission than meets the eye. The gripping narrative is filled with scientific facts as the explorers navigate the subterranean world and come across the animals that live there.