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