Project Indigo was Earth's first experimental teleportation device, which was reverse-engineered by UNIT from captured Sontaran teleport pods.
The first person to field-test the prototype was Martha Jones. As the device teleported her to her mother's house -- the place she most wanted to be -- it suggests the integration of a neural interface device for determining destination in order to make the technology man-portable. Martha later used the device again to teleport herself to the vicinity a UNIT base in Germany. (DW: Journey's End).
The loss or destruction of Project Indigo and other significant UNIT assets to the Daleks appeared to signal an end to successful human research into stand-alone teleport devices. Instead, efforts would be turned to developing transmat technology that would eventually culminate in the T-Mat (DW: The Seeds of Death) and its successor, the Interstitial Mass Transit System (NA: Transit).
