Trident
A human-dominated world with over 95% of its surface covered by salt water, Trident is home to a dazzling array of life. The oceans are filled with creatures ranging from tiny bivalves to mammoth vertebrates unequaled even by Earth's whales and ichthyosaurs. Small archipelagos create what little land there is, and its valuable real estate is fought over constantly.
Underwater extraction operations have recovered a number of valuable minerals from the ocean floor, including iridium, uranium, and dust-form element zero. A largely lawless world, Trident is home to a rogues' gallery of unethical corporations exploiting the resources of the planet and actual rogues -- criminals, slavers and mercenaries -- working the shadows.
During hurricane season the weather is severe enough to make travel to and from the surface extremely hazardous - most ports close down entirely for the duration.