Secrets of Six Seas

In Secrets of the Six Seas, we enter the 24th century, where humanity stands on the verge of an environmental catastrophe.
Unique submarines – built to clean up pollution and toxic sea waste with purifying spheres – started to go rogue, killing marine life on a massive scale. Since the global community was unwilling to risk the remaining sea life, they called for volunteers to destroy the mad machines, one on one.
You are one of these volunteers.