The deep_caves_of_mars_beta1.zip file you have requested: Maps / Single Player / Deep Caves of Mars - 18.39mb is not available. Perhaps try browsing all files for the game Doom III and upload any files you want to share or are missing. This is the only information we could locate:
This is a single player adventure taking place inside of a base on Mars There are many monsters and evil places. Your mission consists in both making your way through the deep undergrounds of the base and killing as many monsters as you can. The Ancient boss awaits you!