When in a map and/or playing the game, type in the console the following:
The console will respond with "noclip on". A partial cheat and a partial exploit, this will allow you to fly and fly through all within the game map you are on.
Open up Console and write down give health 999. You should have 999 health. This also works with other stuff.
press the "tildi" (~) key to enter the console, then type "give all", press enter, and press "~" again to exit the console, don't forget to press enter after typing it. You should now have everything including such items as:
1 quad damage
1 environment suit
Push Esc then go to options. From options go to cosole then type in god. You should now be able to blast with out worry of health.
Open up the console by pressing~ and write in dmflags 8192 and then ur ammo should either say 999 or at its default ammo