I don't know what the sign says,but if you don't know what to do with the boxes,you click all three boxes on the top(Until they light up),then the one in the middle(the middle box in the middle section), then all of the boxes on the bottom section,then click the lever,after you get the bonus,you light up all the boxes on the right section (all the way down...),the- wait ok,just make an H
It says try world initials :) I used a word unscrambler.
Blue Ridge Tunnel was created in 1858.
The Secret of Butte Ridge - 1921 was released on: USA: 21 April 1921
Extreme Engineering - 2003 Hallandsas Ridge Tunnel Sweden 5-6 was released on: USA: 15 November 2006
Oak Ridge, Tennessee was established as the production site for the Manhattan Project that developed the atomic bomb during World War II. Oak Ridge's nicknames include the Secret City.
An eskers
The length of the mid-ocean ridge system is more than 70,000 kilometers
The Mid-Atlantic Ridge. Potentially the East African Rift system in the future
Mid-ocean ridge system.
Tunnelling or undermining. The ridge was tunnelled into & the tunnel packed with explosives under the German lines. It was a very big bang !
Appalachian
Mammoth-Flint Ridge Cave system with over 390 miles of passageways.