The RT video The Permafrost Mystery: scientists explore giant Yamal Sinkhole (with English subtitles) shows scientists exploring the formation. In one scene after about
14:00 two scientists are deploying a device made of two perhaps 30 meter or more long wires(?) separated by about 1.2 meters, held apart by a rigid brace. One scientist holds some electronic equipment with a cable going down to one side of the brace.
Two screenshots are shown below. I can't tell if these long green wires go down into the hole as well or if those are something different, but I think they do, eventually.
Can anyone identify this instrument and what it measures, or at least provide some insightful educated speculation?