posted on Mar, 22 2013 @ 04:18 AM
Back in the late 60's and early 70's in Vietnam, the US military had a project called SpikeBouy ,(Igloo-white), where radio and sensitive seismic
sensors, disguised as small tree shrubs, were dropped along the Ho Chi Min train to monitor enemy movements in the area. The transmitters were
encased in the artificial tree's trunks and there was a large metal spade spike on the end. They would drop them at relatively low altitude in the
forest around the trail and they would embed themselves in the soil. If the shrubs picked up vibrations in the ground or large noise , then would
turn on and transmit to reconnaissance aircraft patrolling at high altitude.
I would imagine that this technology could be easily adapted to injecting trees into sparse areas, and why would you need a plastic bubble around it?