Lester del Rey 
Attack from Atlantis [EPUB ebook] 

Get ready for an unforgettable underwater adventure in Lester del Rey’s Attack from Atlantis! Join teen-aged Don Miller as he boards the atomic-powered submarine Triton for its first official depth test run. But when the ship malfunctions and the crew encounters strange bubble men riding extinct sea creatures, they find themselves dragged to a mysterious city on the ocean floor. As prisoners of a superstitious race with secret powers, Don and the others must plot a daring escape. Will they find a way to turn the Atlanteans‘ weakness into a weapon and break free from this city of no return? Dive into this thrilling tale that will keep you on the edge of your seat while exploring fascinating legends of what might lie hidden beneath the sea.