Arc Mine Shipment is a written note found in The Knife of Dunwall.
I have great appreciation for the use of your space and your whales in the advance of my studies. All of Dunwall will be in your debt for your contribution to my work. In light of your recent – difficulties – I have prepared for you a gift of my latest defensive technology, the Arc Mine. It is based on my Arc Pylon, and will provide superb protection against intruders and those who would interfere with our efforts. I am certain the device will serve you well.
It can be found by the first batch of Arc Mines, in the breakhouse in the Rothwild Slaughterhouse yard during the mission A Captain of Industry.