Titles from separate title pages; works bound back to back and inverted.

Under water -- Under earth.

Hundreds of fascinating facts are waiting to be unearthed in this book from Aleksandra and Daniel Mizielinski, the creative duo behind 'Maps'. Dive below the surface, and find out what happens under the earth and under the water. From early submarines and deep-sea life, to burrowing animals and man-made tunnels - you will never look at the world in the same way again!--