Acid Air

When Greg awakes in a nuclear submarine K264's decompression chamber, he finds himself alone. All the crew are just piles of ash. Also, the computer produces a hologram of a young woman called Nedda. More sinister is that the air on the surface has become poisoned, there is no contact with anyone and it seems that he is alone in the world . Shontel is stranded in a deep cave on Vancouver Island. On finding her way out she discovers that everyone is dead and encircling thunderclouds never go away. Contact is made with Greg and she is rescued, just before the clouds disperse and acid air surrounds her. Nedda admits that she is more than just a computer hologram but an advanced life-form who can metamorphose into human form from her natural amoeba state. She arrived on the submarine to help Greg but was followed aboard by another of her species, a terrorist who attacks her. Why is Nedda attacked and will evil forces stop them from finding the truth and returning home?