How do you build towers underground?

Can someone tell me how to build towers underground?

What do mean by towers?

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SFGAm: SCREAM. THRILL. REPEAT. Two New Coasters in 2001!

I mean Roto-Drops and Whoa Belly

you did up all the ground in that eara then build it
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True of all great coasters of the past and present, and future it's a ride you'll remember for the rest of your lifeand probably will want to ride again.

If I understand what you are asking, the easiest way is to use a trainer. If you use the Dragons trainer you can paint the section you want in the 3rd color. Open the trainer and select rides. Find the ride in the list, and choose bury parts of the ride in 3rd color (or something like that). Now you will have that section underground. I hope that helps some.

In the real game, you don't. Like CoasterBGW said, you lower all the land and then build it down there, but if you want a more "underground" effect you can have a path go all the way around it right next to the tower so it shoots or drops right through it. Makes a cool effect and a great excitement rating.

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Po!nt of View: A different look at Roller Coasters.
http://www.crosswinds.net/~justmayntz/thrills/index.html