155 mm huh? Did they use NATO standard mortars to make these boreholes :p? | Hacker News

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NewJazz 9 months ago | parent | context | favorite | on: US Government funds pilot project for heated sand ...

155 mm huh? Did they use NATO standard mortars to make these boreholes :p?

dubcanada 9 months ago [–]

There is no standard borehole size, 155mm drill head is quite easily acquired in Canada

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