Steve Barlow & Steve Skidmore 
Atlantis Assault 
Atlantis Quest 4

The final battle to save Earth takes place deep underwater in this final book in the Atlantis Quest series. With the cloaking device installed in the Barracuda you take the fight to Triton, but you must get to the heart of the city to defeat him. And how will you stop his invasion force?You are the hero of this book. Only you can decide your own destiny…