Both me and my friend are unable to use the seismic detector in the first mission in Russia.
We tried a new savegame, we tried different trucks, always the same issue.
Once you are in the correct place, press 7 to activate, the animation starts, the 4 arms lower, but stops there.
Menu disappears, you can't drive anymore, nothing happens (we left it for 5 minutes). Only option is to quit the game.

Hi, this is already fixed in the current version 6.1.

It works, no problem with it.
It can also be seen in the attached video.
link text