Minesweeper

"Fergus Frew thought he knew what to expect when he signed up with the Navy's demolitions team. But as the Korean War rages on, Fergus and his fellow divers--a.k.a. 'frogmen'--are tasked with more than just scouting mudflats. Soon they're planting mines. And sabotaging tunnels, bridges--and even fishing nets. Scariest of all, it falls to Fergus to discover where the enemy has placed their mines, a job as painstaking as it is dangerous"--Dust jacket flap.