Tom Swift and the Electronic Hydrolung

Tom Swift and the Electronic Hydrolung plunges Tom Swift Jr. into a whirlwind of space-age danger, underwater sabotage, and nonstop invention. When a Jupiter probe missile carrying priceless deep-space data is brought back toward Earth, Tom directs the delicate recovery from the ship Recoverer, only to spot a mysterious third radar blip: an enemy "thief missile" trying to steal the probe's secrets. After a collision sends the probe crashing somewhere near the St. Paul Rocks, Tom and Bud Barclay launch a high-tech search that leads them into a deeper menace—a hidden enemy submarine with weapons that seem to fire from invisibility. As Tom races to outwit the foe, he invents a compact breathing device for skin divers, then takes on a new breakthrough in submarine defense: a jetmarine that can see through a sonar "echo relay" trick. Between scientific puzzles and perilous dives, Tom also faces kidnapping, coded pleas for help, and a police rescue that exposes a criminal plot. Even a square dance becomes part of the intrigue when a fake fiddler and suspicious strangers hint at enemy interference. Through it all, Tom's brilliance, courage, and teamwork drive a thrilling battle to recover the lost missile and stay one step ahead of sabotage. This edition has been fully restored with modern typesetting, custom cover design.