A hidden UAC base on Phobos: Not satisfied with their achievements, scientists have developed a new kind of teleporter, capable of not only sending things through space, but also through time and into different dimensions. There were two prototypes of this machine but one morning, one of them was found missing! Needless to say that one lone marine is sent through the second device, to find out where the missing prototype might be and who is behind the theft...
From scratch; uses some external resources (see below)
From 1998 - 2004 and 2010 - 2012 => a quadrillion hours