Where to get aketine in Arknights: Endfield

In Arknights: Endfield, aketine is a material you can find around Talos-2 to make Industrial Explosives (and you will have to make some of these for a story quest). These explosives are useful to keep on-hand as it’ll let you crack open passageways that you wouldn’t be able to otherwise, but aketine seems like a fairly rare material to find.