Foundations 2

"Gravel is abundant and easy to obtain. Why not put it to good use as foundations for our buildings?"

Research Unlocks: Prerequisites: Resources required for research (Varies with how long the research is)
 * 3x3 Foundation
 * 4x2 Foundation
 * 4x4 Foundation
 * Small Helipad
 * 3x3 Water Foundation
 * Dock Siding
 * Foundations I
 * Gravel
 * Hard Metal