Gordon R Dickson 
Secret Under Antarctica [EPUB ebook] 
Under the Sea book 2

Dive into adventure in the last unknown territory on Earth – the sea. Join Robby Hoenig and a cast of characters as unusual as any ever met on a distant planet . . .In the second Robby Hoenig adventure, Secret Under Antarctica, a scientific expedition becomes a race to stop a terrorist plot for world-wide disaster, buried beneath the ice of the South Pole . . .Gordon R. Dickson’s Robby Hoenig adventures are timeless young adult stories in the tradition of Arthur C. Clarke’s Dolphin Island.