Visit Your Local PBS Station PBS Home PBS Home Programs A-Z TV Schedules Watch Video Donate Shop PBS Search PBS
BUILDING BIG Spacer image with 5 links within the image
The Tunnel Challenge
BUILDING BIG Home Page BUILDING BIG Site Map BUILDING BIG Labs BUILDING BIG Databank BUILDING BIG Glossary
Bridges
Domes
Skyscrapers
Dams
Tunnels
Buy the DVD
_  

Explosives Under River
The explosion sent gobs of mud flying everywhere!

Gunpowder _+_ Under water __ Wrong
Learn more       Tunnel Score: 0

The soil here is wet and soppy, so when the explosives blow up, the mud breaks apart, and your whole tunnel caves into a gooey mess. Explosives work much better for excavating rock tunnels. Try this technique in a rock tunnel to find out why!


Start Over   Tool or Technique   Try this tool in the next location
Start
over
  Check out another
tool or technique
  Try this tool in
the next location


  _
_