In this post-apocalyptic flooded world, the remaining humans have only two means of transportation – by boat or by plane. The ocean is dangerous, full of predators which, no longer threatened by humans and lacking their usual prey, have taken to hunting the two-legged land dwellers for food. The air is safe – but it is also expensive. Every flying vessel still operational requires fuel. And fuel is abundant, although hidden in underground tanks now submerged in the ocean. But the pressure sometimes causes them to burst, creating spills which would once spell an ecological disaster. Recovering and purifying fuel is a dangerous venture.

A perfect opportunity for all those brave or reckless enough to risk the predator-infested waters.