Datacenter · Strong theory
Plenum Crawler: Covert Presence in Underfloor & Ceiling Voids
Finds a person hiding under the raised floor or above the ceiling tiles.
The physics is solid; our own validation is scheduled.
How it works
Even a person lying perfectly still under the floor is breathing, and breathing gently ripples the WiFi signals passing through that space. Cameras and motion sensors cannot see into these voids at all — the radio waves already travel through them.
In the physics: A crawling/stationary human in a confined void still produces breathing-band (0.1-0.5Hz) CSI micro-modulation and low-velocity Doppler; the plenum acts as a partial waveguide, so links grazing it are strongly perturbed by a body that is invisible to every optical sensor in the room.
See it work
This is real pipeline output for Datacenter, replayed. The exact reading depends on your room.
Go deeper
How the field becomes an answer
How we prove it
Breathing/presence detection proven (class A) in open rooms — validate in the confined-void geometry: own-hardware raised-floor mockup with a person prone under tiles, measure detection AUC vs. empty plenum baseline; sanity-check features against SenseFi/EHUNAM respiration benchmarks.
Who it is for
Coverage for the spaces your cameras and PIRs physically cannot see — 'nobody hides under the floor of this datacenter' — sold to red-team-humbled security directors of tier-4 facilities.
runtime Runs today in LatentField 2.0 as through_wall_presence
The matching solution
Complete first-room estimateCage & Plenum Sentinel6 nodes · ~$320 parts · 120 min Request kit, subscribe, or set up →Compatible DIY hardware options
120 min · advanced
240 min · installer