Annotation. The search for a WW2 Japanese submarine in a bottomless underwater cavern is the opportunity Rob Nash needs to rebuild his once glittering career in underwater exploration. Since losing his wife in a controversial cave diving accident he has been shunned by friends and sponsors and left with a secret terror of tight underwater spaces. But Nash soon learns the price of redemption will consume every molecule of self-belief he possesses. For he must not only battle himself, but a gang of ruthless terrorists hell-bent on unleashing a monstrous weapon that has lain dormant in the depths for seventy years.