You arrive on the planet appropriately named "The Swamp." I imagine you can guess why it is called this. The entire planet is covered with a swampy ecosystem that supports some very unique organisms, but cannot support a wide variety of biodiversity. In fact, The Swamp used to be a beautiful planet with biodiversity that rivaled Biodiversus Maximus until the chemistry of the environment began to change due to many factors. This transformed the entire planet's ecosystem into the nasty swamp.
This planet is used to study the effects of too much air pollution, excessive acidity in soils, and many other environmental factors. The only intelligent (well....intelligent might be an overstatement) lifeform on The Swamp is a humanoid that likely knows where to find the third set of coordinates. Talk to the alien to find out more....