What instrumentation and/or measurement is likely being shown in this video of giant Siberian craters/sinkholes? 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?

Potentially related Detecting and Mapping Gas Emission Craters on the Yamal and Gydan Peninsulas, Western Siberia
It looks like a geophysical method. But a wide variety of such methods have been applied to the Yamal crater by Olenchenko et al. (2015):

The complex of geophysical survey techniques included electrical resistivity tomography (ERT), near-field transient electromagnetic sounding (Transient Electro Magnetic (TEM) sounding), magnetic survey, and radioactivity survey.

I'd say it looks like the first one (ERT), but it's just an &quot;educated speculation&quot;! :)