[21twelve]

By “huge mines”, are you talking about where they would tunnel under the enemy’s position, and fill the tunnel with explosives?

Yeah - that would be a surprise for the home developer.

[Spktyr]

Correct, yes.

[hanamizu]

“By “huge mines”, are you talking about where they would tunnel under the enemy’s position, and fill the tunnel with explosives?”

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Yes. One that was set off was heard over 100 miles away in London. There was a lot of WWI that was fought underground. It was very nasty work.