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From the moment
Tom Swift finds himself tossed about helplessly in an undersea geyser to his
rendezvous with imprisonment or death at the hands of his enemies, the young
inventor fights to overcome incredible odds and obstacles in his latest daring
project: drilling for valuable helium gas in the depths of the sea. Tom's
revolutionary water-repelling machine makes possible the construction of his
hydrodome, an underwater city of derricks and tanks amid the crushing pressures
of the ocean floor. But the strange undersea mountain that looms over Helium
City is stalked by a phantom submarine that threatens the subocean workers, and
the entire world, with a banned neurotoxin of fantastic potency. Tom struggles
to uncover a ruthless spy and saboteur with a grudge against the Swifts in a
tale of high-voltage peril and suspense that stretches from Swift Enterprises
to the shadowed seafloor far beneath the waves.