[hanamizu]

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

---

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.

[PAR35]

<< There was a lot of WWI that was fought underground. It was very nasty work.>>

Battle of the Crater in the War of Northern Aggression - Seige of Petersburg.

https://en.wikipedia.org/wiki/Battle_of_the_Crater