Sapper Geologist
@SapperGeologist
Army Reserve SME: military engineer + interests in critical materials, subterranea & military geology. Views and beard are my own. RTs not endorsements.
参加 December 2017
944 フォロー中 2.2K ファン
@traysartech @SpencerGuard
Urban drilling / tunnelling technology.
Thanks to @ianvisits for the original post 👍🏻
