This alphabet book* will reveal the secrets of the underground and underwater worlds. First of all, it will take the reader on an unusual journey deep into the Earth, where they will meet cavers, miners, and subway passengers; find fossilised dinosaur bones, ancient objects that are hundreds of years old, and edible roots. He will also travel through the labyrinths of caves, go down to the bottom of the world's deepest mines, deeper and deeper - right up to the hot core of the Earth...

And then he will go on an extraordinary journey through the depths of the seas and oceans, where he will meet record-breaking divers and scientists on research ships, come across fabulously coloured fish, sea giants and strange creatures living in the water. He will try out ancient submarines, dive into deep-sea wells and discover the remains of the sunken Titanic. Large and detailed illustrations will take you deeper and deeper - from sun-bathed coral reefs to the deepest place in the oceans, plunged into darkness and cold.

* Alligator is a combination of two literary works in one book. To read the second work, you need to turn the book over and read from the other side.