Nanomachines
From the Metal Gear Wiki
Nanomachines are tiny microscopic machines which are injected into people's blood to distinguish that person for various uses. The tech became more prominent towards the turn of the century, and could allow for many different uses, including:
- Codec conversations: Nanomachines recognize specific frequencies and use them to contact certain people.
- Security: During the Big Shell Incident, in order for Solidus Snake to launch Arsenal Gear, he had to allow President Johnson to enter in a sort of "biological" code into the Black Box of his own free will. They are able to detect this via his Nanomachines transmitting various signals to the Black Box, such as Heartbeat, Brain Waves, etc.
- Storing information: Solidus told Raiden that his Nanomachines were carrying information on who The Patriots really were. They seem to be able to store memories as well, and if retrieved from a dead person and transplanted to another, can allow the dead person to "possess" the other, as with Screaming Mantis by Psycho Mantis, and Liquid Ocelot. With Mantis, the Sorrow's presence seemed to indicate a true spiritual possession, and Ocelot had used psychotherapy as well to make himself "possessed."
- Medical: Vamp being made near immortal with his nanomachines or Naomi Hunter's nanomachines fighting off her cancer.
- SOP: a major military aid made possible thanks to Nanotechnology.
