Mars One is an ambitious project, to say the least. The company behind the project aims to establish a permanent human settlement on Mars. Crews of four will depart every two years, if everything going according to plan. People should start on their journey sometime in 2024. However, the first unmanned mission will be launched in 2018 (again, if everything goes according to plan).
The young men and women who volunteered to make the trip to the Red Planet will be setting up permanent residence there, and we do mean permanent. No return trip for this flight will (or can) occur. The colonists that make the voyage will ultimately have to adapt to the environment of the planet, which is cold, dry, and kind of rusty (Literally. Mars has lots of iron oxide, hence the red landscape.) If there is a major catastrophe, there will be no help — no one coming to answer an SOS. Yet, these people are still willing to venture into the unknown. Why would they do such a thing?
The list of potential Mars explorers will be made even smaller on February 16th of this year (2015), meet those competing to be the first humans to land on the Red Planet, and get to know their story, in the below video: