When you find the key you will have to go to the Al-Safwa quarry, near where you can use the key to the Kushaak construction warehouse.
When you arrive, you will have to look for a pool in which you will have to dive. In the background will be the box in question, but below the visibility is not good, so look carefully.
Make sure you don't overdo it so you don't end up accidentally drowning. Thus, we end this guide on where to find quarry worker’s lost toolbox in DMZ Warzone 2, so we hope we have been of the greatest possible help to you.
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