You can move through anything solid, including walls.However, the default can be changed by opening CDSHOCK.EXE in a hex editor and changing the byte at offset 0x1643E8 from 01 to 00 (this assumes you're playing the CD-ROM version). Changing it in CYB.CFG isn't normally possible, since the game deliberately ignores the value in the config file if it's set to zero.

This is controlled by the config file variable 'time_passes', which has a default value of 1. System Shock has a 'free movement' mode which allows you to essentially stop time and move around the level without any of that pesky physics or collision detection getting in the way. This page also covers the Enhanced Edition released in 2015, which contains all of the original version's content. Considered a cult classic, it spawned a more commercially-successful sequel and is credited with inspiring the even more successful Deus Ex and BioShock. System Shock is a first-person shooter with adventure and RPG elements. Released internationally: September 22, 2015 (Enhanced Edition) Developers: Looking Glass Studios (original),

System shock manual