You're the captain of the baddest submarine in the country, and you were given the task of eliminating all the enemies that will be above and below the vast ocean. Protect your base, and make sure to sink those ships and put all those submarines in the depths of the blue sea. The tide is going to be tricky, so make sure you know how to operate and glide through the tides. The tasks are hard, so you'd better upgrade your sub as soon as you get those funds from all the successful missions that you have done.