The Blue Planet

Earth has no more clean drinking water. In a last attempt to survive humanity sends a colony to a plant that is mostly ocean. The ocean is comprised of drinking water and can be filtered and sent to Earth. This is planet 5B-7229. Humanity set up bunkers every 5 miles from each other that can withstand extreme pressures. On Planet 5B-7229 it rains for the majority of a month. The rain only stopping for a week, then starting up again. The land can only be walked on for three days, four days after the rain stops. This is when repairs are done. Then it is back to the waiting. Humanity isn't along on this planet, there are dark creatures that lurk in it's depths, waiting for a time to strike.