The tank cutter used by the tech (Tom Oliver) to make a hole in the alien container only has a cutting depth of about 1 inch, but when it is removed to take out the cut core, the removed core is at least 4-5 inches in length.
At nearly 12 minutes, when Anne Stone chases after Russell Stone on horseback (he's attacking hippy Ben), a boom operator wearing a red jumper and holding a very long boom pole can clearly be seen at the bottom of the frame.