The part about the empty barrels and the ones that were filled with water would indicate that yes, a process of siphoning was involved. I&#x27;d reckon the crew came up with some pretty innovative techniques, but I&#x27;d also reckon the investigators would rather not make too much public. As in, the facility in West, Texas that exploded (and cost a lot of lives and damage) was frequently targeted by alleged methamphetamine producers for the regulated chemicals on site.