1. low frequency engery waves...
The type caused by (fill in the blank)
(fill in the blank) below surface. I believe geologically and engineering wise hamas recent collapses may be related to urban activities up on surface. Traffic and construction. From what I have seen in photos the tunnels are not carved out solid limestone but a packed congomulate of sand,stone and clays hence the cement bulk work shoring.
Vibration man, good vibration.
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