Garden of Eden Creation Kit (Fallout 3)

A Garden of Eden Creation Kit, also known as a G.E.C.K, is a miscellaneous item in Fallout 3.

Background
This version of the G.E.C.K. is a far more advanced piece of technology than the implied agricultural starter kit the developers of the previous games intended it to be, possibly containing some sort of chemical fusion based molecular assembly-device: In this case, when included as a component within Project Purity's Purifier, the G.E.C.K. helps that other technology remove all radioactive particles from the water of the River Potomac that flows through it.

In Fallout 3, it is possible for the Lone Wanderer to reach the GECK instead of allowing Fawkes to retrieve it, thus allowing the player to activate it. If activated on its own, a blue energy ball expands around the GECK killing the player's character and, after a burst of white light, the nearest save game is loaded.

Characteristics
When the Lone Wanderer locates his/her father in Stanislaus Braun's Vault 112, he/she learns that in order to make Project Purity work properly, he/she requires a G.E.C.K. After James' demise at the hands of Colonel Augustus Autumn, the Wanderer makes their way to Vault 87, a horrendously irradiated location, where they acquire a G.E.C.K. unit.

The Kit has the appearance of a small, silver briefcase emblazoned with the letters "G.E.C.K."; according to Vault-Tec advertisements, it contains all the seeds, fertilizer, and other equipment (including a cold fusion power generator and a basic replicator) necessary to start a new settlement in a post-nuclear world after emerging from a Vault shelter.

Each Vault was presumably issued with two GECKs, except for Vaults 112 and 101. Vaults 112 and 101 were never issued GECKs because they were never intended to be re-opened; each was an experiment in permanent confinement.

The Garden of Eden Creation Kit is a device capable of radically altering the Wasteland and transforming dead, irradiated soil into viable land suitable for farming; it is implied, though not confirmed, that this is the usual mode of operation for a GECK in Fallout 2. However, there is significant disagreement as to what a GECK actually does; the only time we see one properly in action (rather than merely the results) is in Fallout 3.

Location
The G.E.C.K. can be found in Vault 87 in a radioactive chamber, whereby it is nearly impossible for the Lone Wanderer to obtain by themselves: it is wisest to send Fawkes in one's stead.