Marineris Base is an industrial mining water research unit located in the center of Valles Marineris, a large tectonic "crack" in the Martian crust. It is the largest canyon of the Solar System with 4000Â km (2500Â mi) long, 200Â km (120Â mi) wide and up to 7Â km (23000Â ft) deep.
The canyon's...