The Deep Sea Hypothesis was proposed in recent years by a group of researchers studying extreme supernatural phenomena. They believe that the seafloor as we know it is not the deepest part of the ocean, but a flowing layer of matter. Beyond this layer lies another habitable space. There, the quantum souls of the dead are transformed into physical forms by energy from the Earth's core.
It was all just a joke, until an incident occurred during a mission by a deep-sea probe sent out by the Planetary Research Institute. The entire probe vanished without a trace on the ocean floor. The last communication received by the research team was just one short sentence: We are sinking.