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Isotope X-22
Information
Type Key Item
First Found Level 2 - Research
Destructible No
Stackable No
[Source]

Isotope X-22 is a key item found in System Shock.

It can be found in the southernmost quadrant of Level 2, in the westernmost room past a bulkhead that requires a Science Access Card to open. There it will be inside a room clearly marked with radiation danger signs, under a shield that can be disabled with a nearby button.

Dr. Nathan D'Arcy attempted to use Isotope X-22 in a desperate bid to stop SHODAN from firing Citadel Station's mining laser against targets on Earth, but was assassinated by one of her cyborgs before he could do so. SHODAN placed the isotope in a radioactive room and recalled the Station's hazard suits to prevent attempts to retrieve it.

In order to overload the laser with the isotope it must first be placed in the Radiation Shield Generator on Level R (be sure to activate the shield after placing the Isotope, if you do not want to do SHODAN's work for her). Even with the shields protecting Earth, the Laser Override Code must entered in a keypad on that same level or a failsafe will prevent the laser's destruction. These two steps can also be done in reverse. Finally, the laser itself must be fired from the large red control button in the central room in Level 2.


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