The Mars Underground. Word Search Puzzle Solver. The Mars Underground word Search Puzzle Game. Find words related to movie actors, actresses, and genres. Word Search Puzzle Solver. The Mars Underground is a landmark documentary that brings to life through the use of state-of-the-art 3D animation the daring first human mission to the red planet and explores the challenges of surviving on Mars. This includes identifying and searching for words that are related to : Robert Zubrin, Documentary, Rob Thorne .