Sally Spray is an author of children's non-fiction books. She studied Early Years Education, then an MA in Children's Literature, and worked as a teacher before becoming an art director in children's publishing. Sally lives in the Cotswold countryside, and enjoys daily chats with her chickens, daughters and sometimes her husband, the illustrator Mark Ruffle. Her mission is to find out loads of interesting, really hard to understand stuff and pass it on to her readers as simply and concisely as possible.

• 1: Going Underground1: Thames Tunnel1: New York City Subway1: Holland Tunnel1: Seikan Tunnel1: Channel Tunnel1: Oresund Tunnel1: Laerdal Tunnel1: Boston Big Dig Project1: Smart Tunnel1: Hadron Collider Tunnel1: Gotthard Base Tunnel1: Fascinating Facts1: Further Information1: Glossary1: Index

Sally Spray is an author of children's non-fiction books. She studied Early Years Education, then an MA in Children's Literature, and worked as a teacher before becoming an art director in children's publishing. Sally lives in the Cotswold countryside, and enjoys daily chats with her chickens, daughters and sometimes her husband, the illustrator Mark Ruffle. Her mission is to find out loads of interesting, really hard to understand stuff and pass it on to her readers as simply and concisely as possible.

• 1: Going Underground1: Thames Tunnel1: New York City Subway1: Holland Tunnel1: Seikan Tunnel1: Channel Tunnel1: Oresund Tunnel1: Laerdal Tunnel1: Boston Big Dig Project1: Smart Tunnel1: Hadron Collider Tunnel1: Gotthard Base Tunnel1: Fascinating Facts1: Further Information1: Glossary1: Index