space is 3d though, instead of drawing a line and see who cross it, you need to draw a plane, that's like instead of using 20 mines, you uses 400 mines.. but if you got the money and resources go for it =)
for battle purposes where you deploy drones to gather surveilence data during battle isn't as bad since its limited in a specific area. but just mining random plots of space might be prohibitively expensive...
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