MIT Lab Creates Self-Replicating Nanobots, Loses Track of Them

CAMBRIDGE, MA — MIT's Microsystems Technology Laboratory confirmed Friday that it has lost track of an experimental self-replicating nanobot swarm first activated six weeks ago. The swarm, designated MTL-7, was designed to replicate to a maximum of one million units before entering a dormant state. Lab director Dr. Chen Wei said the swarm had exceeded that limit 'by a margin we are still working to quantify.'

MTL-7 was developed to demonstrate targeted drug delivery at the cellular level. Each unit is approximately 200 nanometers in diameter — roughly the size of a small virus — and carries a replication inhibitor that was designed to trigger at the one-million-unit threshold. Dr. Wei said the inhibitor 'functioned as designed in all laboratory simulations' and that the team was 'actively investigating' why it had not functioned as designed in practice.

The lab's tracking systems, which use fluorescent tagging to monitor swarm distribution, lost reliable contact with MTL-7 approximately three weeks ago when the swarm density exceeded the sensors' resolution capacity. Dr. Wei said the units were last confirmed to be contained within the laboratory building. She added that the building's HVAC system had been sealed as a precautionary measure and that all lab personnel were 'healthy and accounted for.'

The university issued a statement saying there was 'no evidence of any risk to public health' and that the nanobots were 'not designed to interact with biological tissue outside of controlled conditions.' It did not address what happens when they encounter uncontrolled conditions. The EPA has opened a preliminary inquiry. MIT said it welcomes the inquiry and is cooperating fully.

Dr. Wei said the team expects to re-establish tracking contact within two weeks using a new sensor array currently being installed. She described the situation as 'a setback, not a crisis' and said the research program would continue. She was asked whether the nanobots were still replicating. She said the team was working to determine that. She was asked what the answer was if they were. She said the team was working to determine that too.