Noclip

Noclip, also known as fly and ghost, is a cheat that disables the effect of gravity and the effect of world solids on you. This allows you to glide freely through the world. Although this is a good way of drawing nav_ meshes, if you are playing on a server then as you may notice your crosshairs are as far out as they can go. If you exit the world or simply fly into a wall you'll not be able to shoot. You cannot die. Entity's such as point_hurt will not effect you.

Warning: If you try too far out of the map ( out of hammer workspace ) the game would crash. This will also occur if the sv_noclipspeed is too high.