This War of Mine: Construction Site Soldiers Guide
There was a faster way to do it before but it no longer works as the 2nd soldier refuses to follow you down the ladders.
This is the most efficient way to do it now, that I could come up with at least.
For the first visit you only need a crowbar/1 lockpick and 1 saw blade.
The 2nd time you visit, the underground area will be accessible as the water will be gone. You want to bring 1 saw blade for the underground area.
Melee only (shovel) from hiding spots using Katia.
https://this-war-of-mine.fandom.com/wiki/Construction_Site#Scenario:_Soldiers
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