Primitive Tool on MSN

Creating a Stunning Underground Temple With Secret Tunnel and Pool Using Only Mud and Stone

Each wall and passage is shaped from mud and stone using patience and ancient skill as the builder transforms the ground ...
Practical Engineering on MSN

How Engineers Build Tunnels by Sinking Them Underwater

Immersed tube tunneling sounds impossible - instead of drilling, engineers build giant tunnel sections on land, float them out to sea, and sink them with precision. It’s one of the most daring feats ...