Inject a chemical glue to make the soil hard
You're on the right track.

In the 1970s, engineers had to strengthen the weak, sandy soil beneath the world's fifth and sixth tallest buildings -- the twin towers of the World Trade Center in New York City -- with a special chemical process. Unfortunately, chemical "glue" is an expensive process -- too expensive for your budget. Luckily, there is a cheaper method.

Try again!