Comments by "Dean Firnatine" (@deanfirnatine7814) on "Search-and-rescue teams in Surfside to work overnight into Sunday" video.

And where did you get that info? it is not true, it all depends on how porous the ground or structure is, obviously this is a collapsed building so very porous with crevices and open spaces for air(thus scent) to make its way upwards. FYI I train search dogs and was a member of a regional FEMA team.
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