stackyFACTS
Transport

Why tunnel builders freeze the ground

HERE’S THE INTERESTING PART

To prevent structural collapsing, transit crews sometimes blast the surrounding soil with liquid nitrogen. They literally carve through solid frozen mud just to build your morning commute.

Why tunnel builders freeze the ground
STACKY / Transport
One discovery leads to another.

Keep exploring facts in this topic.

Transport →
STACKY FOR IPHONE

A bigger world.
One discovery
at a time.

Keep discovering with Stacky. Interesting facts in an app that is always within reach.

Download on the App Store
ONE MORE DISCOVERY?

Keep exploring

All in this topic →
StackyMore discoveries in the app
Download on the App Store