The Immortality Technique is samyama on the Immortality Sutra.
The result of this samyama is an infusion of Paramajyoti into the physical body that will transform the physical body into a Satyug physiology. This Paramajyoti will be utilized for one's own transformation processes.
Paramajyoti originates in the Transcendental Field beyond all universes. It is the Effulgence of Krishna that animates all universes. You will see Paramajyoti illustrated in the image on the right, between the upper Absolute Realm and the lower relative realm. Click on the image for a larger view.
To utilize Paramajyoti for personal transformation processes, one can either have no specific process intention and then the Paramajyoti will go to the place where it is most needed, or one can have an intention for help with a specific process and the Paramajyoti will all go to that process.
At the beginning of the day of Brahma when the Universe is first created from the model universe of Goloka, there is nothing to block Paramajyoti from bathing the entire Universe with this highest frequency pure light. As karma is created by the jivas of the Universe, this karma gathers in the Universe like dark clouds that partially block Paramajyoti from from reaching the individual jivas. As this karma accumulates, Sat Yuga transitions to Trita Yuga. Then more karma accumulation results in the transition to Dwipara Yuga. And finally when the dark clouds of accumulated karma is very heavy, the transition to Kali Yuga comes.