Sinkholes form where bedrock underlies soil and water creates underground voids. Let's explore what sinkholes are and how they form.

The galleries inside Hoover Dam are impressive. Are they used for inspections? Let’s explore their purpose.

The Channel Tunnel is linking England and France beneath the English Channel. Crossing the violent English Channel via an underground tunnel has been one of mankind’s greatest engineering dreams. Lets explore th piston relief ducts.

Mariana Trench is the deepest depths of the ocean formed due to the collision of two tectonic plates—specifically, one highly dense plate colliding with a less dense one.