One hundred million years ago, a vast waterway called the Western Interior Seaway split North America in two. Geologists assume that the seaway drained off the North American continent as tectonic plates converged-but what if the water went underground instead? What if there's a vast ocean beneath our feet, teeming with ancient creatures we thought had perished long ago? The first book in the Thunderstruck series, explores this possibility with a thrilling story of discovery and courage. What begins as a scientific expedition quickly becomes a fight for survival as two university scientists and their teenage kids find themselves trapped in an ancient underground world called Cretacea, face to face with nature's most fearsome creatures. is a thrilling adventure with concepts based on the latest scientific discoveries. Readers will find themselves immersed in the world of the subterranean sea and will witness its beauty and terrors. Just when you think the explorers will make it out alive, a new horror blocks their path. Can human ingenuity outsmart the raw chaos of Mother Nature?