Tom Swift and His Big Tunnel
: Mr. Job Titus of Titus Brothers Construction Company wants to purchase some of Tom's Giant Cannon powder to use in a tunnel construction project in Peru. Titus Bros. has contracted to drive a railroad tunnel through an Andes mountain peak and has hit a deposit of "hard, dense rock, like Obsidian." If the tunnel cannot be completed on time Blakeson & Grinder, a rival company, will get the contract and reap the reward, while the Titus Brothers will be ruined. Tom develops a blasting powder based on his Giant Cannon propellant, and in the company of Titus and Mr. Damon leave for South America. Many hardships threaten the project's completion. During construction a lost subterranean city is found. It becomes a stop on the rail line and ultimately, a tourist attraction (Tom Swift Unofficial Home Page).