Standing five miles back from the black ring, she got her first glimpse of the humans' efforts to stop the Tide from advancing. Various large towers belched liquid flames at the nanomachines that formed the outer ring of this threat. According to the humans, high temperatures were one of the only things found to actually destroy the devices. Certain acids also worked, but they weren't able to produce them in the large quantities needed. In addition, there were large, cylindrical devices pointing towards the Tide itself. Those were devices they called lasers that the humans were using to try and burn away the Tide, apparently using beams of focused light